Dynamic cable tension testing instrument

Abstract

The invention discloses a dynamic cable tension testing instrument, and particularly relates to the technical field of bridge engineering monitoring. The dynamic cable tension testing instrument comprises a mounting base, a mounting frame is fixed to the bottom of the mounting base, two riding wheels are rotatably mounted on one side of the mounting frame and located on the same level, a pressing wheel assembly is arranged on one side of the mounting frame, and the pressing wheel assembly is matched with the two riding wheels to press a traction cable to be bent. The pressing roller assembly comprises a frame, a pressing wheel is rotationally installed in the frame, during detection, the traction cable is located between the two riding wheels and the pressing wheel, and a triangular frame is arranged below the frame. The dynamic cable tension test instrument provided by the invention can collect data of the pressure sensor in the moving process of the traction cable, can monitor the tension change of the traction cable in real time, and provides real-time data support for construction.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering monitoring, and in particular to a dynamic cable tension testing instrument. Background Art

[0002] In recent years, suspension bridges, due to their large spanning capacity and beautiful appearance, are often used as a key link connecting geographical barriers and have an irreplaceable and important position in my country's infrastructure construction.

[0003] As the main load-bearing structure of a suspension bridge, the strength and stability of the main cable directly determine the reliability and durability of the bridge, and play a decisive role in ensuring the stability of the bridge under the influence of external factors such as wind load and temperature change. The erection of the main cable strands of a suspension bridge is one of the most critical and technically demanding processes in the construction of a suspension bridge. It is necessary to install a winch and a temporary traction cable to pull the numbered strands from the anchor to the top of the bridge tower. When the strands reach the top of the bridge tower, they are positioned and fixed according to the designed position. However, the traction cable faces many hazards during the hoisting process: first, the risk of overload. The traction cable needs to withstand huge tension. Once the material's bearing limit is exceeded, it may cause structural instability; second, the risk of vibration and fatigue. The continuous stress cycle caused by factors such as wind load and mechanical vibration may cause fatigue damage to the traction cable, accumulating into a hidden danger of fracture; finally, the risk of wear. The traction cable is susceptible to wear due to its repeated use and when it passes through components such as bridge towers, shortening its service life. The above damage will seriously affect the carrying capacity of the traction cable, resulting in inaccurate erection of the main cable, and endangering the structural safety and stability of the bridge after completion. In addition, the breakage or serious damage of the traction cable will not only cause the interruption of the construction process, delay the construction period, and increase the construction cost, but also cause safety accidents, seriously threatening the safety of the operators. Therefore, the traction cable must be strictly monitored and maintained during the process of lifting the main cable to ensure its stability and reliability. By real-time monitoring of the force of the traction cable, potential risks such as overload and unbalanced tension can be discovered and prevented in time, ensuring the safe installation of the main cable during the construction process. In addition, accurate force data helps to optimize the construction plan, improve the construction quality, ensure the safety of the operators, and provide reliable protection for the long-term stable operation of the bridge. Therefore, the monitoring of the force of the traction cable during the construction of the suspension bridge is not only a technical requirement, but also a necessary measure for construction safety and quality management.

[0004] At present, the cable tension measuring instruments used in bridge engineering can only measure static cable tension. Once the cable moves, it cannot meet the requirements. The actual engineering use is very limited and can only realize the prestressing measurement of steel bars. During the installation process of the main cable of the suspension bridge, the traction cable is dynamic and the traditional tension meter cannot realize the measurement, let alone real-time measurement.

[0005] Therefore, it is necessary to provide a dynamic cable tension testing instrument to solve the above technical problems. Summary of the invention

[0006] In view of the above situation, in order to overcome the defects of the prior art, the present invention provides a dynamic cable tension testing instrument that can collect data from a pressure sensor during the movement of the traction cable, and can monitor the tension changes of the traction cable in real time, providing real-time data support for construction.

[0007] To achieve the above purpose, the technical solution adopted by the present invention is as follows:

[0008] A dynamic cable tension tester comprises: a mounting seat, a mounting frame is fixed at the bottom of the mounting seat, two supporting wheels are rotatably mounted on one side of the mounting frame, the two supporting wheels are at the same level, a pressure roller assembly is arranged on one side of the mounting frame, the pressure roller assembly cooperates with the two supporting wheels to compress the traction rope to bend, the pressure roller assembly comprises a frame, a pressure roller is rotatably mounted inside the frame, during testing, the traction rope is located between the two supporting wheels and the pressure roller, a triangular frame is arranged below the frame, a pressure sensor is fixed on the top of the triangular frame, the pressure sensor is fixed to the frame, and the pressure sensor is fixed to the frame. A laser rangefinder is also provided below the frame, and the laser rangefinder is used to measure the moving distance of the frame. In the initial state, the moving distance of the frame measured by the laser rangefinder is. In this case, the traction cable is in contact with the two supporting wheels and the pressure wheel, and the traction cable is in a horizontal state. When measuring the tension of the traction cable (as shown in the figure), the frame moves and drives the pressure wheel to move, forcing the traction cable to bend, and the bending angle is θ. The moving distance of the frame can be measured by the laser rangefinder and can be defined as L. When the traction cable pulls the bridge cable, its tension is defined as T, and the length of the traction cable between the two supporting wheels is defined as H.

[0009] Preferably, a fixing plate is fixedly mounted on one side of the mounting frame, a first screw rod penetrates the fixing plate, the first screw rod is threadedly connected to the fixing plate, and one end of the first screw rod is rotatably connected to the triangular frame.

[0010] Preferably, two nuts are installed on the first screw rod, and the two nuts are respectively located above and below the fixing plate.

[0011] Preferably, a T-shaped block is fixed to one side of the frame close to the mounting frame, and a T-shaped slot is provided on one side of the mounting frame, and the T-shaped block can be installed in the T-shaped slot.

[0012] Preferably, both ends of the mounting seat are equipped with limit assemblies, the limit assemblies include a fixed wheel group and a moving wheel group, the fixed wheel group is fixed to the bottom of the mounting seat, the movable is installed on the mounting seat, the fixed wheel group includes a first fixed shaft, the moving wheel group includes a second fixed shaft, pulleys are movably installed on the first fixed shaft and the second fixed shaft, the pulleys can move up and down and rotate, baffles are fixedly installed on the bottom ends of the first fixed shaft and the second fixed shaft, a spring is arranged on the baffle, the spring is in contact with the baffle, and the top end of the spring is in contact with the pulley.

[0013] Preferably, a block is fixedly installed on the top of the second fixed shaft, and a slot is provided at the bottom of the base. The block can be installed in the slot. When the block is installed in the slot, the moving wheel group can only move laterally. A fixing screw is also threadedly installed on the base. The fixing screw extends into the slot and is threadedly connected to the block. The block is fixed in the slot under the action of the fixing screw. In this case, the moving wheel group is fixed on the base.

[0014] Preferably, a connecting assembly is installed on the top of the base, and the connecting assembly is used to connect the base to a gantry for on-site construction. The connecting assembly includes a telescopic rod, one end of which is rotatably connected to the base, and the other end of the telescopic rod is rotatably installed with a fixed seat, and the fixed seat can be fixedly connected to the gantry.

[0015] Preferably, the connecting assembly includes a first connecting rod rotatably connected to the base and a second connecting rod rotatably connected to the fixed seat, a second screw rod is rotatably mounted on the second connecting rod, the second screw rod is threadedly connected to the first connecting rod, a hexagonal block is fixedly mounted on the second screw rod, two insertion rods are fixedly mounted on one side of the second connecting rod, and both of the insertion rods can be inserted into the interior of the first connecting member.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] (1) The present invention collects data from the pressure sensor during the movement of the traction cable, and can monitor the tension change of the traction cable in real time, providing real-time data support for construction;

[0018] (2) The present invention performs tension testing on the traction rope by using a three-point bending method, which can accurately measure the tension of the traction rope and improve the accuracy and reliability of the measurement.

[0019] (3) The present invention can conveniently adjust the vertical displacement of the pressure wheel and the position of the measuring part by rotating the first screw rod and the second screw rod, making the operation simpler and faster.

[0020] (4) The base of the present invention can rotate, so that the device can better adapt to the changes of the traction rope during the traction process, ensuring that the measurement can be carried out stably.

[0021] (5) The design of the limit assembly of the present invention can play a certain limiting role when the traction rope swings greatly, thereby preventing the traction rope between the two supporting wheels from swinging greatly and improving the stability of the measurement.

[0022] (6) The arrangement of the connection assembly of the present invention makes it easier to install the traction rope on or remove it from the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of the structure of a dynamic cable tension tester provided by the present invention;

[0024] Figure 2 for Figure 1 A schematic diagram of the structure of the pressure wheel assembly in the dynamic cable tension test instrument provided;

[0025] Figure 3 for Figure 1 A schematic diagram of the structure of the frame in the dynamic cable tension test apparatus shown;

[0026] Figure 4 for Figure 1 A schematic diagram of the structure of the base and the mounting frame in the dynamic cable tension tester shown;

[0027] Figure 5 for Figure 4 A magnified view of part A;

[0028] Figure 6 for Figure 1 The structural schematic diagram of the moving wheel group in the dynamic cable tension test instrument shown;

[0029] Figure 7 for Figure 1 A schematic diagram of the structure of the connection components in the dynamic cable tension test instrument shown;

[0030] Figure 8 This is the principle diagram of cable tension calculation using the three-point bending method;

[0031] Fig. 9 A schematic diagram of an embodiment of the dynamic cable tension testing instrument provided by the present invention.

[0032] Among them, the names corresponding to the figure marks are: 1-mounting seat, 2-mounting frame, 3-support wheel, 4-frame, 5-pressure wheel, 6-triangle frame, 7-pressure sensor, 8-first screw, 9-fixed plate, 10-laser rangefinder, 11-T-block, 12-T-slot, 13-nut, 14-first fixed shaft, 15-pulley, 16-second fixed shaft, 17-baffle, 18-spring, 19-block, 20-slot, 21-fixed screw, 22-first connecting rod, 23-second connecting rod, 24-second screw, 25-hexagonal block, 26-insertion rod, 27-fixed seat. DETAILED DESCRIPTION

[0033] The present invention is further described below in conjunction with the accompanying drawings and embodiments. The embodiments of the present invention include but are not limited to the following embodiments.

[0034] Example 1

[0035] like Figure 1-9 As shown, the dynamic cable tension tester provided by the present invention comprises: a mounting seat 1, a mounting frame 2 is fixed at the bottom of the mounting seat 1, two supporting wheels 3 are rotatably mounted on one side of the mounting frame 2, and the two supporting wheels 3 are at the same level, a pressure roller assembly is arranged on one side of the mounting frame 2, and the pressure roller assembly cooperates with the two supporting wheels 3 to compress the traction rope to bend, and the pressure roller assembly comprises a frame 4, and a pressure roller 5 is rotatably mounted inside the frame 4. During detection, the traction rope is located between the two supporting wheels 3 and the pressure roller 5, a triangular frame 6 is arranged below the frame 4, a pressure sensor 7 is fixed on the top of the triangular frame 6, and the pressure sensor 7 is fixed to the frame 4, and a laser rangefinder 10 is also arranged below the frame 4, and the laser rangefinder 10 is used to measure the moving distance of the frame 4. In the initial state, the moving distance of the frame 4 measured by the laser rangefinder 10 is 0. In this case, the traction rope is in contact with the two supporting wheels 3 and the pressure roller 5, and the traction rope is in a horizontal state. When measuring the tension of the traction rope (such as Figure 8 As shown in the figure, the frame 4 moves and drives the pressure wheel 5 to move, forcing the traction cable to bend, and the bending angle is θ. The moving distance of the frame 4 can be measured by the laser rangefinder 10 and can be defined as L. When the traction cable pulls the bridge cable, its tension is defined as T, and the length of the traction cable between the two supporting wheels 3 is defined as 2H.

[0036] The following three-point bending method is used to test the tension of a traction cable. The geometric relationship between the traction cable and the test device and the corresponding force decomposition principle diagram are shown in the figure below. Figure 8H is the longitudinal distance between the two end stress points and the central stress point of the three-point bending test device. This dimension is related to the structure of the device and can be a known data; θ is the tension angle, which reflects the longitudinal push-off degree of the traction cable; F is the lateral force of the central stress point on the traction cable. The relationship between the traction cable tension T and F can be obtained from the force analysis:

[0037] =2Tsinθ

[0038] From the geometric structure of the device, we can get:

[0039]

[0040] From the above formula, we can get the traction cable tension T as a function of the longitudinal force F, the lateral distance H and the lateral push distance L of the traction cable:

[0041]

[0042] Since the distance parameter is fixed, T is proportional to F. The force F is obtained by using the pressure sensor 7. The output signal of the force sensor is calculated, corrected and amplified by the circuit, and the value is the tension T of the measured traction rope. The amplification factor is calculated according to the above formula.

[0043] Example 2

[0044] like Figure 2 As shown, a fixing plate 9 is fixedly installed on one side of the mounting frame 2, and a first screw rod 8 passes through the fixing plate 9. The first screw rod 8 is threadedly connected to the fixing plate 9, and one end of the first screw rod 8 is rotatably connected to the triangular frame 6. When the frame 4 needs to be moved, the first screw rod 8 is rotated to move the triangular frame 6 upward. The upward movement of the triangular frame 6 drives the frame 4 upward through the pressure sensor 7. The movement of the frame 4 drives the pressure wheel 5 upward. The pressure wheel 5 moves upward to bend the traction rope.

[0045] Furthermore, two nuts 13 are installed on the first screw rod 8, and the two nuts 13 are respectively located above and below the fixed plate 9. When the frame 4 moves upward to the specified position, the two nuts 13 are rotated so that the two nuts 13 are close to the fixed plate 9. At this time, the first screw rod 8 is fixed under the action of the two nuts 13, so that during the measurement process, the first screw rod 8 will not rotate easily, which ensures that the pressure wheel 5 will not move easily, thereby ensuring the accuracy of the test.

[0046] Example 3

[0047] like Figure 3-4As shown, a T-shaped block 11 is fixed to one side of the frame 4 close to the mounting frame 2, and a T-shaped slot 12 is opened on one side of the mounting frame 2. The T-shaped block 11 can be installed in the T-shaped slot 12. During the movement of the frame 4, the cooperation between the T-shaped block 11 and the T-shaped slot 12 ensures the stable operation of the frame 4.

[0048] Example 4

[0049] like Figure 1 As shown, both ends of the mounting seat 1 are equipped with limiting components, and the limiting components include a fixed wheel group and a moving wheel group, the fixed wheel group is fixed at the bottom of the mounting seat 1, and the movable wheel group is installed on the mounting seat 1, the fixed wheel group includes a first fixed shaft 14, and the moving wheel group includes a second fixed shaft 16, and pulleys 15 are movably installed on the first fixed shaft 14 and the second fixed shaft 16, and the pulley 15 can move up and down and rotate, and the bottom ends of the first fixed shaft 14 and the second fixed shaft 16 are fixedly installed with baffles 17, and springs 18 are arranged on the baffles 17, and the springs 18 are in contact with the baffles 17, and the top of the springs 18 is in contact with the pulley 15. When in use, the traction rope is located between the two limiting components. When the traction rope swings greatly, the two limiting components can play a certain limiting role on the traction rope, thereby preventing the traction rope located between the two supporting wheels 3 from swinging significantly, and the limiting components play a limiting role on the traction rope.

[0050] Furthermore, if Figure 5-6 As shown, a block 19 is fixedly installed at the top end of the second fixed shaft 16, and a slot 20 is provided at the bottom of the base 1. The block 19 can be installed inside the slot 20. When the block 19 is installed inside the slot 20, the moving wheel group can only move laterally. A fixing screw 21 is also threadedly installed on the base 1. The fixing screw 21 extends to the inside of the slot 20 and is threadedly connected with the block 19. The block 19 is fixed inside the slot 20 under the action of the fixing screw 21. In this case, the moving wheel group is fixed on the base 1. When the traction rope needs to be installed on or removed from the device, the fixing screw 21 is first removed, and then the block 19 is moved laterally to remove the moving wheel group. At this time, the traction rope can be installed on or removed from the device.

[0051] Example 5

[0052] like Figure 1As shown, a connecting component is installed on the top of the base 1, and the connecting component is used to connect the base 1 to the gantry of the on-site construction. The connecting component includes a telescopic rod, one end of which is rotatably connected to the base 1, and the other end of the telescopic rod is rotatably installed with a fixed seat 27, and the fixed seat 27 can be fixedly connected to the gantry. In this embodiment, the base 1 can be rotated, so that the device can be more adaptable to changes in the traction rope during the traction process. During the traction process of the traction rope, it has a certain swing amplitude in the vertical direction, and the base 1 rotates, so that the supporting wheel 3 and the pressure wheel 5 can swing and move with the traction rope, so that the traction rope can be measured at any time, ensuring that the measurement can be carried out stably.

[0053] Furthermore, if Figure 7 As shown, the connecting assembly includes a first connecting rod 22 rotatably connected to the base 1 and a second connecting rod 23 rotatably connected to the fixing seat 27, a second screw rod 24 is rotatably installed on the second connecting rod 23, the second screw rod 24 is threadedly connected to the first connecting rod 22, a hexagonal block 25 is fixedly installed on the second screw rod 24, when it is necessary to rotate the second screw rod 24, a wrench is clamped on the hexagonal block 25 and the wrench is turned, and the second screw rod 24 is rotated, and the distance between the first connecting rod 22 and the second connecting rod 23 can be adjusted by rotating the second screw rod 24. In actual measurement, the base 27 needs to be installed on the door frame first, and then the traction rope is installed at the specified position. However, if the distance of the connecting assembly is long, Therefore, when in use, first adjust the distance between the first connecting member 22 and the second connecting member 23 to the minimum by rotating the second screw rod 24, and then install it on the traction rope. After the traction rope is installed, increase the distance between the first connecting member 22 and the second connecting member 23 by rotating the second screw rod 24, so that the device is not affected by the door frame during use. Two plug rods 26 are fixedly installed on one side of the second connecting rod 23. Both of the two plug rods 26 can be inserted into the interior of the first connecting member 22 and limit the first connecting rod 22. While ensuring the rotation of the second screw rod 24, the first connecting rod 22 can move stably.

[0054] Detection method:

[0055] (1) First stop the traction rope installed on the mast and install the device on the mast;

[0056] (2) Rotate the first screw rod 8 to adjust the vertical displacement of the pressing wheel 5 (the adjustment distance can be 2 cm);

[0057] (3) The traction rope is allowed to move again, and the traction rope tension is calculated by collecting the real-time data curve of the vertical displacement and the compressive stress detected by the pressure sensor.

[0058] Working principle: When in use, first adjust the distance between the first connecting rod 22 and the second connecting rod 23 to the minimum, while ensuring that the displacement of the pressure wheel 5 is 0, and then install the entire device on the door frame, then remove the two moving wheel groups, install the traction rope between the two supporting wheels 3 and the pressure wheel 5, and then install the moving wheel group back to the base 1. At this time, the two pulleys 15 should be clamped on both sides of the traction rope, and then rotate the first screw rod 8 to adjust the pressure wheel 5 to a suitable distance, and finally rotate the second screw rod 24 to fix the measuring part to a suitable position, collect the data of the pressure sensor during the movement of the traction rope, and measure the tension of the traction rope.

Claims

1. A dynamic cable tension tester, characterized in that: include: A mounting seat (1), a mounting frame (2) is fixed at the bottom of the mounting seat (1), two supporting wheels (3) are rotatably mounted on one side of the mounting frame (2), and the two supporting wheels (3) are at the same level, a pressure roller assembly is arranged on one side of the mounting frame (2), and the pressure roller assembly comprises a frame (4), a pressure roller (5) is rotatably mounted inside the frame (4), a triangular frame (6) is arranged below the frame (4), a pressure sensor (7) is fixed on the top of the triangular frame (6), and the pressure sensor (7) is fixed to the frame (4), and a laser rangefinder (10) is also arranged below the frame (4).

2. A dynamic cable tension tester according to claim 1, characterized in that: A fixing plate (9) is fixedly mounted on one side of the mounting frame (2), a first screw rod (8) passes through the fixing plate (9), the first screw rod (8) is threadedly connected to the fixing plate (9), and one end of the first screw rod (8) is rotatably connected to the triangular frame (6).

3. A dynamic cable tension tester according to claim 2, characterized in that: Two nuts (13) are installed on the first screw rod (8), and the two nuts (13) are respectively located above and below the fixing plate (9).

4. A dynamic cable tension tester according to claim 1, characterized in that: A T-shaped block (11) is fixed to one side of the frame (4) close to the mounting frame (2), and a T-shaped slot (12) is provided on one side of the mounting frame (2), and the T-shaped block (11) can be mounted in the T-shaped slot (12).

5. A dynamic cable tension tester according to claim 1, characterized in that: Both ends of the mounting seat (1) are provided with a limit assembly, the limit assembly comprising a fixed wheel assembly and a moving wheel assembly, the fixed wheel assembly being fixed at the bottom of the mounting seat (1), the movable wheel assembly being mounted on the mounting seat (1), the fixed wheel assembly comprising a first fixed shaft (14), the moving wheel assembly comprising a second fixed shaft (16), pulleys (15) being movably mounted on the first fixed shaft (14) and the second fixed shaft (16), baffles (17) being fixedly mounted at the bottom ends of the first fixed shaft (14) and the second fixed shaft (16), a spring (18) being arranged on the baffle (17), the spring (18) being in contact with the baffle (17), and the top end of the spring (18) being in contact with the pulley (15).

6. A dynamic cable tension tester according to claim 5, characterized in that: A clamping block (19) is fixedly mounted on the top end of the second fixed shaft (16); a clamping slot (20) is provided at the bottom of the base (1); a fixing screw (21) is also threadedly mounted on the base (1); the fixing screw (21) extends into the inside of the clamping slot (20) and is threadedly connected to the clamping block (19).

7. A dynamic cable tension tester according to claim 1, characterized in that: A connection assembly is installed on the top of the base (1), and the connection assembly comprises a telescopic rod, one end of which is rotatably connected to the base (1), and the other end of which is rotatably installed with a fixed seat (27), and the fixed seat (27) can be fixedly connected to the door frame.

8. A dynamic cable tension tester according to claim 7, characterized in that: The connecting assembly comprises a first connecting rod (22) rotatably connected to the base (1) and a second connecting rod (23) rotatably connected to the fixing seat (27); a second screw rod (24) is rotatably mounted on the second connecting rod (23); the second screw rod (24) is threadedly connected to the first connecting rod (22); a hexagonal block (25) is fixedly mounted on the second screw rod (24); two insertion rods (26) are fixedly mounted on one side of the second connecting rod (23); both of the two insertion rods (26) can be inserted into the interior of the first connecting member (22).

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