Prestressed anchor cable tensioning method and device

Abstract

The invention discloses a pre-stressed anchor cable tensioning method and device, and relates to the field of bridge anchor cable construction, the pre-stressed anchor cable tensioning device comprises a connection control system, the control system comprises a control device, the control device controls an intelligent adjusting device to adjust the tightness of a steel wire rope inhaul cable, and the control device comprises a display screen and a control chip. Different sensors and intelligent adjusting devices are annularly arranged at different positions inside and outside the bridge pier model, monitoring of the annular reinforcing effect of the steel wire rope inhaul cable on the bridge pier model is collected and measured in multiple dimensions, and the intelligent cable force adjusting device of the steel wire rope inhaul cable is controlled through the control system to adjust the cable force of the steel wire rope inhaul cable. Control simulation of the effect of the steel wire rope inhaul cable intelligent adjusting and pier strengthening model is achieved, and quantitative and reliable data support and foundation are provided for practical engineering application of steel wire rope inhaul cable circumferential pier strengthening.

Description

Technical Field

[0001] The present invention relates to the field of bridge cable anchor construction, and particularly relates to a prestressed cable tensioning method and device thereof. Background Art

[0002] The pier is an important part of the bridge structure, and its stability is directly related to the safety and service life of the bridge. With the rapid development of modern transportation, the loads borne by bridges are increasing continuously, and at the same time, the erosion of the natural environment (such as wind, rain, earthquake, etc.) also poses higher requirements for the stability of the pier. In order to improve the bearing capacity and disaster resistance of the pier, the prestressed cable reinforcement technology is widely used in the reinforcement project of the pier.

[0003] The traditional prestressed cable reinforcement method has the following problems: First: Insufficient stress monitoring. In the traditional method, the monitoring means for the tensile force of the wire rope cable, the internal stress and the surface stress of the pier are relatively limited, and it is impossible to comprehensively and accurately evaluate the reinforcement effect; Second: Low adjustment accuracy. In actual engineering, the tensile force of the wire rope cable needs to be dynamically adjusted according to the actual stress condition of the pier, but there is a lack of effective intelligent adjustment devices in the traditional method, and it is difficult to achieve precise cable force adjustment; Third: Complicated construction. The installation and tensioning process of the traditional prestressed cable requires a large amount of manual operation, the construction efficiency is low, and it is easy to cause uneven tensile force or unreasonable stress distribution due to human factors.

[0004] Therefore, it is very necessary to propose a prestressed cable tensioning method and device to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a prestressed cable tensioning method and device thereof to solve the problems of insufficient stress monitoring, low adjustment accuracy and complicated construction.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A prestressed cable tensioning method, comprising the following steps: S101, first tension the cable, prepare a pier model, set a wire rope cable on the pier model, and the wire rope cable is annularly distributed on the outer periphery of the pier model; S102, arrange a sensor assembly, and the sensor assembly includes a magnetic flux sensor, a pressure sensor, an axial steel bar strain gauge, a radial steel bar strain gauge, a circumferential steel bar strain gauge and a strain sensor; There is a type A groove reserved on the outer surface of the pier model, and the type A groove is used for installing the magnetic flux sensor; There is a type B groove provided on the outer surface of the pier model, and the pressure sensor is installed in the type B groove; The pier model includes axial steel bars, radial steel bars, and circular steel bars. Axial steel bar strain gauges, radial steel bar strain gauges, and circumferential steel bar strain gauges are respectively installed on the axial steel bars, radial steel bars, and circular steel bars. A plurality of strain sensors are installed on the surface of the pier model in a conforming manner. C-type grooves are reserved at different positions on the surface of the pier model, and a reserved intelligent adjustment device is installed in the C-type grooves. S103, Tension the wire rope cable to the design force F. Measure the tensile force FC of the wire rope cable wound around different positions on the surface of the pier model through a magnetic flux sensor, measure the normal pressure FY of the wire rope cable wound around different positions on the surface of the pier model through a pressure sensor, and measure the axial internal stress FN10, radial internal stress FN11, and circumferential internal stress FN12 of the wire rope cable for strengthening the pier through the axial steel bar strain gauges, radial steel bar strain gauges, and circumferential steel bar strain gauges on the surfaces of the axial steel bars, radial steel bars, and circular steel bars respectively. Measure the surface stress FB of the concrete at different positions on the surface of the pier model where the wire rope cable is wound through a strain sensor. S104, Connect the control system. The control system includes a control device. The control device controls the intelligent adjustment device to adjust the tightness of the wire rope cable. The control device includes a display screen and a control chip.

[0007] The present invention also discloses a device for tensioning a prestressed anchor cable, which is applicable to the prestressed anchor cable tensioning method. One end of the pressure sensor is fixedly provided with an embedded plate, and the other end is rotatably provided with a rotating disk. An arc-shaped guide plate is slidably arranged on the rotating disk. When the wire rope cable is annularly distributed on the outer periphery of the pier model, the wire rope cable moves through the arc-shaped guide plate.

[0008] Preferably, a cable head rod is fixedly provided at the end of the wire rope cable. The surface of the cable head rod is smooth. A threaded rod is provided at one end of the cable head rod away from the wire rope cable, and a threaded nut is connected to the threaded rod through thread fit.

[0009] Preferably, the intelligent adjustment device includes an anchor. The anchor is of a trapezoidal block structure. The side of the anchor that is movably attached to the outer surface of the pier model is an arc surface. Threaded fixing holes are provided on both sides of the upper and lower surfaces of the anchor. Circular holes are provided on both sides of the anchor, and the circular holes penetrate through the trapezoidal inclined surface on the anchor. When fixing the wire rope cable, the cable head rod and the threaded rod at the end of the wire rope cable are movably passed through the circular holes, and the end of the threaded rod extending out of the circular holes is limited by the threaded nut.

[0010] Preferably, the intelligent adjustment device further includes a positioning base plate, a first sliding plate, a second sliding plate and a positioning clamping plate. The positioning base plate, the first sliding plate and the second sliding plate are arranged in sequence. The first sliding plate and the second sliding plate are fixedly connected by a support connecting rod. A guiding support rod is fixedly arranged on the positioning base plate. The guiding support rod movably passes through the first sliding plate and the second sliding plate. One end of the guiding support rod passing through the first sliding plate and the second sliding plate is fixedly connected with the positioning clamping plate. The positioning clamping plates are arranged in pairs up and down. The positioning clamping plate is an L-shaped structure. A threaded fixing rod is connected to the positioning clamping plate by thread fit; When it is necessary to tighten the wire rope cable, clamp a pair of positioning clamping plates on the same side corners of the upper and lower surfaces of the anchor respectively, and then rotate the threaded fixing rod so that the threaded fixing rod is fixed in the threaded fixing hole.

[0011] Preferably, a rotating member is rotatably arranged on the second sliding plate. A threaded fixing sleeve is fixedly arranged at the end of the rotating member. Operate the rotating member so that the threaded fixing sleeve is connected to the end of the threaded rod by thread fit.

[0012] Preferably, an electric oil pump type jack is fixedly arranged on the positioning base plate. The telescopic end of the electric oil pump type jack is fixedly connected with the first sliding plate.

[0013] Preferably, the outer surface of the cable head rod and the inner wall of the circular hole are both smooth.

[0014] Preferably, the wire rope cables are arranged in pairs. Both ends of the two wire rope cables are connected to an anchor at the same time.

[0015] Preferably, an annular sleeve is rotatably sleeved on the outer ring of the cable head rod. The annular sleeve is movably attached to the inner wall of the circular hole.

[0016] The technical effects and advantages of the present invention: In the present invention, different sensors and intelligent adjustment devices are arranged circumferentially at different positions inside and outside the pier model, and the circumferential reinforcement effect of the wire rope cable on the pier model (including internal and external stresses, effective tensile forces, and normal pressures at different positions) is collected and measured in multiple dimensions. And the cable force of the wire rope cable is adjusted by controlling the cable force intelligent adjustment device of the wire rope cable through the control system, so as to realize the control simulation of the intelligent adjustment and reinforcement effect of the wire rope cable on the pier model, providing quantitative and reliable data support and basis for the actual engineering application of the circumferential reinforcement of the wire rope cable on the pier; When the electric oil pump type jack is started, the electric oil pump type jack pulls the first sliding plate to move through the telescopic end. At this time, the first sliding plate, the second sliding plate, the rotating member and the threaded fixing sleeve move synchronously, so as to tighten the wire rope cable, achieving the purpose of adjusting the cable force of the wire rope cable; When the threaded fixing sleeve pulls the threaded rod to move, it can move along the length direction of the circular hole without deviation, ensuring smooth sliding and without a large resistance affecting the accuracy of cable force adjustment; When the wire rope cable is tightened, the embedded groove will slide on the rotating disc, and the rotating disc will rotate at the end of the pressure sensor, thereby making an adaptive avoidance to prevent the wire rope cable from being displaced upward or downward when tightened, resulting in offset stress. This ensures that the pressure sensor accurately measures the normal pressure FY value of the wire rope cable wound at different positions on the surface of the pier model. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the prestressed anchor cable tensioning structure of the present invention.

[0018] Figure 2 Schematic diagram of the radial steel bar strain gauge structure of the present invention.

[0019] Figure 3 Schematic diagram of the control device structure of the present invention.

[0020] Figure 4 Schematic diagram of the pressure sensor structure of the present invention.

[0021] Figure 5 Schematic diagram of the type B groove structure of the present invention.

[0022] Figure 6 Schematic diagram of the wire rope cable structure of the present invention.

[0023] Figure 7 Schematic diagram of the structure when the wire rope cable and the anchor are connected in cooperation of the present invention.

[0024] Figure 8 Schematic diagram of the anchor structure of the present invention.

[0025] Figure 9 Schematic diagram of the structure when the intelligent adjustment device is used in cooperation with the anchor of the present invention.

[0026] Figure 10 Schematic diagram of the intelligent adjustment device structure of the present invention.

[0027] Figure 11 Schematic diagram of the structure when the bottom of the intelligent adjustment device is supported of the present invention.

[0028] Figure 12 Schematic diagram of the structure when the top of the intelligent adjustment device is suspended of the present invention.

[0029] Figure 13 Schematic diagram of the internal structure of the electric oil pump type jack of the present invention.

[0030] Figure 14For the present invention Figure 13 Schematic enlarged view of the structure at location A in

[0031] Figure 15 For the present invention Figure 13 Schematic enlarged view of the structure at location B in

[0032] Figure 16 Schematic diagram of the analysis result of the 1 / 4 finite element model of the solid cylinder of the pier model of the present invention, Figure 16 where (a) is the 1 / 4 finite element model diagram, (b) is the radial stress diagram of the loading plane, and (c) is the circumferential stress diagram of the loading plane.

[0033] Figure 17 Analysis structure diagram of the vertical distribution of the radial stress on the pier model of the present invention.

[0034] Figure 18 Analysis structure diagram of the vertical distribution of the circumferential stress on the pier model of the present invention.

[0035] Figure 19 Longitudinal distribution diagram of the edge circumferential stress of the present invention.

[0036] Figure 20 Finite element result diagram of the vertical stress of the present invention.

[0037] In the figure: 1, pier model; 2, type A groove; 3, magnetic flux sensor; 4, type B groove; 5, pressure sensor; 6, type C groove; 7, intelligent adjustment device; 8, wire rope cable; 9, electric cylinder; 10, axial steel bar strain gauge; 11, radial steel bar strain gauge; 12, circumferential steel bar strain gauge; 13, pier surface strain gauge; 14, control device; 15, arc-shaped guide plate; 16, embedded plate; 17, rotating disk; 18, cable head rod; 19, threaded rod; 20, threaded nut; 21, anchor; 22, threaded fixing hole; 23, circular hole; 24, positioning base plate; 25, first sliding plate; 26, second sliding plate; 27, positioning clamping plate; 28, threaded fixing rod; 29, guide support rod; 30, electric oil pump type jack; 31, support connecting plate; 32, rotating part; 33, threaded fixing sleeve; 34, support connecting rod; 35, first auxiliary pressure sensor; 36, suspension rope; 37, second auxiliary pressure sensor; 38, oil pump housing; 39, oil pump telescopic rod; 40, piston; 41, outer seal; 42, inner seal; 43, first inlet and outlet oil pipe; 44, second inlet and outlet oil pipe; 45, first metal heat exchange cylinder; 46, second metal heat exchange cylinder; 47, connecting pipe; 48, discharge pipe; 49, return pipe; 50, infusion hose; 51, liquid storage tank; 52, heat dissipation box; 53, annular groove; 54, sealing steel ring; 55, sealing rubber ring; 56, first sealing rubber airbag; 57, second sealing rubber airbag; 58, embedded installation groove. Detailed implementation mode

[0038] Example 1 The present invention provides a prestressed anchor cable tensioning method and device as Figures 1 - 15 shown.

[0039] The prestressed anchor cable tensioning method in the present invention includes the following steps: First step: First, tension the anchor cable, prepare the pier model 1, set the wire rope cable 8 on the pier model 1, the wire rope cable 8 is annularly distributed on the outer circumference of the pier model 1, use the sensor assembly to measure various stresses of the wire rope cable 8 and the pier model 1, the sensor assembly includes a magnetic flux sensor 3, a pressure sensor 5, an axial steel bar strain gauge 10, a radial steel bar strain gauge 11, a circumferential steel bar strain gauge 12 and a strain sensor 13. Among them, the axial steel bar strain gauge 10, the radial steel bar strain gauge 11, and the circumferential steel bar strain gauge 12 all use fiber Bragg grating sensors; Use the magnetic flux sensor 3 to measure the tensile force at different circumferential positions of the wire rope cable 8. First, a type A groove 2 is reserved on the outer surface of the pier model 1, and the type A groove 2 is used to install the magnetic flux sensor 3, and the magnetic flux sensor 3 is used to measure the tensile force FC of the wire rope cable 8 wound at different positions on the surface of the pier model 1; A type B groove 4 is provided on the outer surface of the pier model 1, the pressure sensor 5 is installed in the type B groove 4, a buried plate 16 is fixedly provided at one end of the pressure sensor 5, and a rotating disk 17 is rotatably provided at the other end. An arc-shaped guide plate 15 is slidably provided on the rotating disk 17. When the wire rope cable 8 is annularly distributed on the outer circumference of the pier model 1, the wire rope cable 8 passes through the arc-shaped guide plate 15, and the pressure sensor 5 is used to measure the normal pressure FY of the wire rope cable 8 wound at different positions on the surface of the pier model 1; The pier model 1 includes: axial steel bars, radial steel bars, and circumferential steel bars. Select representative axial steel bars, radial steel bars, and circumferential steel bars (such as the equally divided parts of the pier model 1), and install the axial steel bar strain gauge 10, the radial steel bar strain gauge 11, and the circumferential steel bar strain gauge 12 on the surface of the steel bars (the surface of the steel bars needs to be polished flat). The axial steel bar strain gauge 10, the radial steel bar strain gauge 11, and the circumferential steel bar strain gauge 12 on the surface of the axial steel bars, radial steel bars, and circumferential steel bars are used to measure the axial internal stress FN10, radial internal stress FN11, and circumferential internal stress FN12 of the wire rope cable 8 for strengthening the pier respectively; Strain sensors 13 are installed and attached at different positions on the surface of the pier model 1, and the surface stress FB of the wire rope cable 8 wound at different positions on the concrete surface of the pier model 1 is measured by the strain sensors 13; C-type grooves 6 are reserved at different positions on the surface of the pier model 1, and a reserved intelligent adjustment device 7 is installed in the C-type grooves 6; the intelligent adjustment device 7 is used to adjust the tightness of the wire rope cable 8.

[0040] In the second step, the steel wire rope cable 8 is tensioned to the designed force F (required according to the test). The tension force FC of the steel wire rope cable 8 wound around different positions on the surface of the pier model 1 is measured by the magnetic flux sensor 3. The normal pressure FY of the steel wire rope cable 8 wound around different positions on the surface of the pier model 1 is measured by the pressure sensor 5. The axial internal stress FN10, radial internal stress FN11, and circumferential internal stress FN12 of the pier reinforcement by the steel wire rope cable 8 are respectively measured by the axial steel bar strain gauges 10, radial steel bar strain gauges 11, and circumferential steel bar strain gauges 12 on the surfaces of the axial steel bars, radial steel bars, and circumferential steel bars. The surface stress FB of the concrete at different positions on the surface of the pier model 1 where the steel wire rope cable 8 is wound is measured by the strain sensor 13.

[0041] In the third step, the control system is connected. The control system includes the control device 14. The acquisition and display of all sensor data are in the control device 14. The control device 14 can control the intelligent adjustment device 7 to adjust the tightness of the steel wire rope cable 8.

[0042] It should be noted that the control device 14 may include a display screen and a control chip. Among them, the display screen is used to display all sensor data. The control chip is used to receive the data fed back by all sensors. The control chip can also control the intelligent adjustment device 7. The control chip and the display screen are both common existing technologies and will not be elaborated here.

[0043] In summary, in the present invention, different sensors and the intelligent adjustment device 7 are arranged circumferentially at different positions inside and outside the pier model 1 to collect and measure the annular reinforcement effect of the steel wire rope cable 8 on the pier model 1 (including internal and external stresses, effective tension force, and normal pressure at different positions) in multiple dimensions. And the control system controls the intelligent adjustment device 7 of the cable force of the steel wire rope cable 8 to adjust the cable force of the steel wire rope cable 8, realizing the control simulation of the intelligent adjustment and reinforcement effect of the steel wire rope cable 8 on the pier model 1, providing quantitative and reliable data support and basis for the practical engineering application of the circumferential reinforcement of the steel wire rope cable 8 to the pier.

[0044] Reference Figure 4 As shown in Figure 5The figure shows the structural schematic of the pressure sensor 5 installed in the groove 4 of type B. After the pressure sensor 5 is installed in the groove 4 of type B, the steel wire rope cable 8 wound around the outer periphery of the pier model 1 movably passes through the embedded groove 15 at the end of the pressure sensor 5. When the steel wire rope cable 8 is tightened, the embedded groove 15 slides on the rotating disk 17, and the rotating disk 17 rotates at the end of the pressure sensor 5, so as to adaptively avoid the phenomenon that the steel wire rope cable 8 generates offset stress due to upward or downward displacement when tightened, ensuring that the pressure sensor 5 accurately measures the normal pressure FY value of the steel wire rope cable 8 wound at different positions on the surface of the pier model 1.

[0045] Reference Figure 6 As shown in the figure, it is the structural schematic of the end of the steel wire rope cable 8. A socket rod 18 is fixedly arranged at the end of the steel wire rope cable 8. The surface of the socket rod 18 is smooth. A threaded rod 19 is arranged at the end of the socket rod 18 far away from the steel wire rope cable 8. A threaded nut 20 is connected to the threaded rod 19 by thread fit. The steel wire rope cables 8 on the surface of the pier model 1 are arranged in pairs. After two steel wire rope cables 8 wind around the pier model 1 for one week, the head and tail ends are connected by the intelligent adjustment device 7, and the intelligent adjustment device 7 includes an anchor 21.

[0046] Reference Figure 7 and Figure 8 As shown in the figure, the anchor 21 is of trapezoidal block structure. The side of the anchor 21 that movably fits on the outer surface of the pier model 1 is an arc surface. Threaded fixing holes 22 are arranged on both sides of the upper and lower surfaces of the anchor 21. Circular holes 23 are arranged on both sides of the anchor 21, and the circular holes 23 penetrate through the trapezoidal inclined surface of the anchor 21. When fixing the steel wire rope cable 8, the socket rod 18 and the threaded rod 19 at the end of the steel wire rope cable 8 movably pass through the circular holes 23, and the end of the threaded rod 19 extending out of the circular holes 23 is limited by the threaded nut 20. After the threaded nut 20 is tightened, the steel wire rope cable 8 can be tightened.

[0047] Reference Figure 9 and Figure 10As shown in the figure, the intelligent adjustment device 7 further includes a positioning substrate 24, a first sliding plate 25, a second sliding plate 26 and a positioning clamping plate 27. The positioning substrate 24, the first sliding plate 25 and the second sliding plate 26 are arranged in sequence. The first sliding plate 25 and the second sliding plate 26 are fixedly connected by a support connecting rod 34. A guiding support rod 29 is fixedly arranged on the positioning substrate 24. The guiding support rod 29 movably passes through the first sliding plate 25 and the second sliding plate 26. One end of the guiding support rod 29 that movably passes through the first sliding plate 25 and the second sliding plate 26 is fixedly connected to the positioning clamping plate 27. The positioning clamping plates 27 are arranged in pairs up and down. The positioning clamping plate 27 is of an L-shaped structure. A threaded fixing rod 28 is connected to the positioning clamping plate 27 by thread fit. When it is necessary to tighten the steel wire rope cable 8, a pair of positioning clamping plates 27 can be respectively clamped at the same side corner of the upper and lower surfaces of the anchor 21, and then the threaded fixing rod 28 is rotated to fix the threaded fixing rod 28 in the threaded fixing hole 22, completing the relative fixation of the positioning clamping plate 27 and the anchor 21. A rotating member 32 is rotatably arranged on the second sliding plate 26. A threaded fixing sleeve 33 is fixedly arranged at the end of the rotating member 32. Operating the rotating member 32 can make the threaded fixing sleeve 33 connected to the end of the threaded rod 19 by thread fit, realizing the relative fixation of the threaded fixing sleeve 33 and the end of the steel wire rope cable 8. An electric oil pump type jack 30 is fixedly arranged on the positioning substrate 24. The telescopic end of the electric oil pump type jack 30 is fixedly connected to the first sliding plate 25. When the electric oil pump type jack 30 is started, the electric oil pump type jack 30 pulls the first sliding plate 25 to move through the telescopic end. At this time, the first sliding plate 25, the second sliding plate 26, the rotating member 32 and the threaded fixing sleeve 33 move synchronously, so as to tighten the steel wire rope cable 8, achieving the purpose of adjusting the cable force of the steel wire rope cable 8.

[0048] It should be noted that the positioning substrate 24, the first sliding plate 25, the second sliding plate 26 and the positioning clamping plate 27 are also arranged on the opposite sides of the upper and lower surfaces of the anchor 21. However, since the ends of the two steel wire rope cables 8 are simultaneously connected to an anchor 21, the positions where the two steel wire rope cables 8 are connected to the anchor 21 are staggered. Therefore, the other first sliding plate 25 and the second sliding plate 26 are fixedly connected by a support connecting plate 31. There are two support connecting rods 34 and two support connecting plates 31. The two support connecting rods 34 are arranged between the corresponding two rotating members 32. The two support connecting plates 31 are arranged on the sides far away from each other of the corresponding two rotating members 32. This is an operation that can be adjusted by those skilled in the art according to actual needs and will not be elaborated here.

[0049] Further, the outer surface of the cable head rod 18 and the inner wall of the circular hole 23 are both kept smooth. When the cable head rod 18 passes through the circular hole 23, the cable head rod 18 is coaxial with the circular hole 23. The threaded fixing sleeve 33 is connected to the end of the threaded rod 19, and the threaded fixing sleeve 33 is also coaxial with the cable head rod 18 and the threaded rod 19. Therefore, when the threaded fixing sleeve 33 pulls the threaded rod 19 to move, it can move along the length direction of the circular hole 23 without deviation, ensuring smooth sliding and there is no large resistance affecting the accuracy of cable force adjustment.

[0050] Furthermore, since the steel wire rope cables 8 are arranged in pairs, and the two ends of the two steel wire rope cables 8 are simultaneously connected to an anchor 21, therefore, when the steel wire rope cables 8 are wound around the outer periphery of the pier model 1, there is a certain deviation angle, that is: spiral distribution. Therefore, when the steel wire rope cables 8 are tightened, it is inevitable that the steel wire rope cables 8 will be subjected to upward or downward stress. At this time, the cable head rod 18 applies the upward or downward stress to the inner wall of the circular hole 23. If the stress is too large, it will increase the resistance between the circular hole 23 and the cable head rod 18, causing the cable head rod 18 to press too tightly against the inner wall of the circular hole 23, resulting in jamming, which affects the adjustment of the cable force. Therefore, an annular sleeve is rotatably sleeved on the outer circle of the cable head rod 18, and the annular sleeve is movably attached to the inner wall of the circular hole 23, so that the cable head rod 18 and the circular hole 23 are transferred through the annular sleeve. In this way, both the inner circle and the outer circle of the annular sleeve can slide or rotate relatively, instead of the original way that the cable head rod 18 can only slide or rotate through the outer circle contact. By increasing the sliding or rotating surface, the jamming phenomenon is minimized as much as possible, and the smoothness of cable force adjustment is improved.

[0051] Reference Figure 11 and Figure 12As shown in the figure, when tensioning the wire rope cable 8, it is first necessary to initially fix the position of the intelligent adjustment device 7 according to the tensioning position; for example, when tensioning the wire rope cables 8 on the upper and middle parts of the outer ring of the pier model 1, the intelligent adjustment device 7 is fixed in a suspended manner. The specific method includes: a suspension rope 36 is connected to the positioning substrate 24, and a second auxiliary pressure sensor 37 and a stretching mechanism are arranged above the suspension rope 36. The second auxiliary pressure sensor 37 can monitor the force of the suspension rope 36 suspending the positioning substrate 24. Considering that connecting the intelligent adjustment device 7 to the wire rope cable 8 will increase the gravity of the wire rope cable 8 and affect the stress monitoring of the wire rope cable 8 and the pier model 1, therefore, the suspension rope 36 can be stretched upward by the stretching mechanism until the value monitored by the second auxiliary pressure sensor 37 is consistent with the sum of the gravity of the positioning substrate 24, the first sliding plate 25, the second sliding plate 26, the positioning card plate 27, the threaded fixing rod 28, the guiding support rod 29, the electric oil pump type jack 30, the support connecting plate 31, the rotating part 32, the threaded fixing sleeve 33 and the support connecting rod 34 on the intelligent adjustment device 7, that is, the influence of the gravity of the intelligent adjustment device 7 on the wire rope cable 8 is avoided, making the stress monitoring values of the pier model 1 and the wire rope cable 8 accurate; It should be noted that the stretching mechanism can use mechanisms such as electric cylinders, which will not be elaborated here.

[0052] When tensioning the wire rope cable 8 on the lower part of the outer ring of the pier model 1, the intelligent adjustment device 7 is fixed in a supported manner. The specific method includes: an electric cylinder 9 is connected to the bottom of the positioning substrate 24, and a first auxiliary pressure sensor 35 is also arranged on the electric cylinder 9. The first auxiliary pressure sensor 35 is used to monitor the gravity generated by the intelligent adjustment device 7. Start the electric cylinder 9 to push upward. When the pressure value monitored by the first auxiliary pressure sensor 35 is consistent with the sum of the gravity of the positioning substrate 24, the first sliding plate 25, the second sliding plate 26, the positioning card plate 27, the threaded fixing rod 28, the guiding support rod 29, the electric oil pump type jack 30, the support connecting plate 31, the rotating part 32, the threaded fixing sleeve 33 and the support connecting rod 34 on the intelligent adjustment device 7, that is, the influence of the gravity of the intelligent adjustment device 7 on the wire rope cable 8 is avoided, making the stress monitoring values of the pier model 1 and the wire rope cable 8 accurate.

[0053] Furthermore, the first auxiliary pressure sensor 35, the second auxiliary pressure sensor 37, the stretching mechanism and the electric cylinder 9 are connected through a controller. The input end of the controller is connected to the output ends of the first auxiliary pressure sensor 35 and the second auxiliary pressure sensor 37, and the output end of the controller is connected to the input ends of the stretching mechanism and the electric cylinder 9. The controller is used to receive the data monitored by the first auxiliary pressure sensor 35 and the second auxiliary pressure sensor 37, and the controller is used to control the operation of the electric cylinder 9 or the stretching mechanism.

[0054] Since there is a certain offset angle in the height direction at both ends of the annularly arranged wire rope cable 8, during the tensioning process of the wire rope cable 8, it is inevitable that the intelligent adjustment device 7 bears stress changes in the up and down directions. If the pressure values monitored by the first auxiliary pressure sensor 35 and the second auxiliary pressure sensor 37 change after the wire rope cable 8 is tensioned, this information can be fed back to the controller, and the controller controls the electric cylinder 9 or the stretching mechanism to operate, thereby adjusting the supporting force or suspension force on the positioning substrate 24, so that the pressure values of the first auxiliary pressure sensor 35 and the second auxiliary pressure sensor 37 are restored, eliminating the errors generated after adjusting the cable force of the wire rope cable 8.

[0055] Embodiment 2 Reference Figures 13 - 15 As shown in the reference, the electric oil pump type jack 30 includes an oil pump housing 38, an oil pump telescopic rod 39 and a piston 40. The oil pump telescopic rod 39 is a solid columnar structure, the oil pump housing 38 is a hollow cylindrical structure, and the piston 40 is slidably arranged in the oil pump housing 38 and divides the interior of the oil pump housing 38 into a first oil chamber and a second oil chamber; the oil pump telescopic rod 39 movably passes through one end of the oil pump housing 38 and is fixedly connected to the piston 40. A first oil inlet and outlet pipe 43 and a second oil inlet and outlet pipe 44 are arranged on the oil pump housing 38. The first oil inlet and outlet pipe 43 and the second oil inlet and outlet pipe 44 are respectively connected to the first oil chamber and the second oil chamber. Both the first oil inlet and outlet pipe 43 and the second oil inlet and outlet pipe 44 are connected to an external electric oil pump through the oil inlet and outlet pipes. The electric oil pump is not shown in the figure and is a supporting power mechanism for the electric oil pump type jack 30, which will not be elaborated here; the end of the oil pump telescopic rod 39 away from the piston 40 is fixedly connected to the first sliding plate 25; when oil is injected into the first oil chamber through the electric oil pump and the oil in the second oil chamber is pumped out, the piston 40 will move in the direction away from the oil pump telescopic rod 39, capable of tensioning the wire rope cable 8; when oil is injected into the second oil chamber through the electric oil pump and the oil in the first oil chamber is pumped out, the piston 40 will move in the direction close to the oil pump telescopic rod 39, capable of resetting the wire rope cable 8, which is convenient to use.

[0056] It should be noted that solenoid valves are provided in both the first oil inlet and outlet pipe 43 and the second oil inlet and outlet pipe 44 to facilitate controlling the on-off of the channels.

[0057] The traditional electric oil pump type jack 30 has the following drawbacks: First, the piston does not rise actively; Reason: Insufficient oil supply of the oil pump, damaged sealing performance, and large piston resistance; Second, the sealing parts are aged or damaged; Reason: After long-term use, the sealing parts may lose their sealing performance due to wear, aging or corrosion.

[0058] The electric oil pump type jack 30 designed in the present invention well solves the drawbacks existing in the traditional electric oil pump type jack 30, including: First, the piston 40 can move smoothly; Second, the sealing performance is improved; Specifically: An inner seal 42 is fixedly arranged on the outer periphery of the piston 40. The inner seal 42 includes an annular groove 53. A sealing steel ring 54 is slidably arranged in the annular groove outside the annular groove 53. The outer ring of the sealing steel ring 54 is in sliding fit with the inner wall of the oil pump housing 38. A sealing rubber ring 55 is fixedly arranged at the outer edge of the outer ring of the annular groove 53. The outer ring of the sealing rubber ring 55 is movably in contact with the inner wall of the oil pump housing 38. An outer seal 41 is also arranged at the position where the oil pump telescopic rod 39 passes through the oil pump housing 38. The outer seal 41 includes a first sealing rubber airbag 56 and a second sealing rubber airbag 57. An embedded installation groove 58 is arranged on the inner wall of the oil pump housing 38. The second sealing rubber airbag 57 is embedded in the embedded installation groove 58. The first sealing rubber airbag 56 is arranged inside the oil pump housing 38 and is in contact with the outer surface of the oil pump telescopic rod 39. The first sealing rubber airbag 56 and the second sealing rubber airbag 57 are communicated with each other. When the oil pressure in the first oil chamber increases, the oil will squeeze the first sealing rubber airbag 56, and the gas in the first sealing rubber airbag 56 will enter the second sealing rubber airbag 57, thereby increasing the pressure of the gas in the second sealing rubber airbag 57 to improve the sealing effect. That is to say, the higher the oil pressure, the better the sealing effect, and there will be no leakage problem.

[0059] When the oil is injected into the first chamber or the second chamber to push the piston 40 to move, the sealing steel ring 54 slides in the annular groove 53, with a small contact area and small resistance, thus avoiding the phenomenon that the piston 40 cannot slide smoothly. The sealing rubber ring 55 plays the role of sealing between the outer ring of the piston 40 and the inner wall of the oil pump housing 38 in real time.

[0060] It should be noted that in the present invention, since the sealing steel ring 54 is slidably arranged on the inner wall of the annular groove 53, even if oil leaks into the annular groove 53 at the contact position between the sealing rubber ring 55 and the oil pump housing 38, the oil will only push the sealing steel ring 54 to slide, achieving a certain degree of redundancy effect, and the oil in the first chamber and the second chamber will not be mixed with each other.

[0061] In the present invention, second metal heat exchange cylinders 46 are fixedly arranged on both sides of the piston 40, first metal heat exchange cylinders 45 are fixedly arranged on the inner walls at both ends of the oil pump housing 38, the second metal heat exchange cylinders 46 are slidably arranged inside the first metal heat exchange cylinders 45, and the second metal heat exchange cylinders 46 communicate with the first metal heat exchange cylinders 45. There are at least two first metal heat exchange cylinders 45 and second metal heat exchange cylinders 46. A plurality of first metal heat exchange cylinders 45 on the same side of the piston 40 are connected by a connecting pipe 47. A discharge pipe 48 and a return pipe 49 are connected to the lowermost first metal heat exchange cylinder 45. An accumulator tank 51 and a heat dissipation tank 52 are arranged outside the electric oil pump type jack 30 in cooperation. The heat dissipation tank 52 communicates with the accumulator tank 51. The accumulator tank 51 and the heat dissipation tank 52 are respectively connected to the return pipe 49 and the discharge pipe 48 through an infusion hose 50. A coolant is stored in the accumulator tank 51, the heat dissipation tank 52, the infusion hose 50, the discharge pipe 48 and the return pipe 49. When the piston 40 reciprocates in the oil pump housing 38, the coolant circulates in the second metal heat exchange cylinder 46, the first metal heat exchange cylinder 45, the connecting pipe 47, the discharge pipe 48, the return pipe 49, the infusion hose 50, the heat dissipation tank 52 and the accumulator tank 51. The coolant in the first metal heat exchange cylinder 45 and the second metal heat exchange cylinder 46 can fully absorb the heat of the oil inside the oil pump housing 38, achieving a good heat dissipation effect. When the coolant is discharged into the heat dissipation tank 52, it is dissipated by a fan or other heat dissipation mechanisms. After being cooled, the coolant enters the accumulator tank 51 for storage and then is recycled, which can fully reduce the heat of the oil and reduce phenomena such as the decrease in sealing performance and service life caused by overheating of the oil.

[0062] Based on the first metal heat exchange cylinder 45 and the second metal heat exchange cylinder 46 provided in the present invention, the limited space in the first oil chamber and the second oil chamber is also fully utilized for heat dissipation; and the amount of oil in the first oil chamber and the second oil chamber is reduced, ensuring sufficient oil pressure and oil supply; and there is also coolant in the first metal heat exchange cylinder 45 and the second metal heat exchange cylinder 46, which also provides stable strength support for the piston 40, achieving the purpose of taking into account heat dissipation, sufficient support strength, and sufficient oil pressure and oil supply.

[0063] Experimental verification shows that: Two pier models 1 can be prepared in the present invention, namely a solid pier with a diameter of 2m and a hollow pier with a diameter of 1.2m; the height of both is 2m; According to the original design drawings of the pier, the vertical steel bars of the solid pier have a diameter of 28mm, and the circular stirrups have a diameter of 8mm, which is convenient for installing pressure sensors. According to the size requirements of the sensors, the distance between two steel bars near the sensors is adjusted to 17cm.

[0064] Table 1 shows the design parameters of the solid pier Bridge pier Solid Outer diameter / m 2 Height / m 2 Vertical reinforcement diameter / mm 28 Total length of vertical reinforcement / m 84 Hoop reinforcement diameter / mm 42 Total length of hoop reinforcement / m 8.53 The vertical steel bars on the outer surface of the hollow pier have a diameter of 25 mm, the vertical steel bars on the inner surface have a diameter of 12 mm, and the circular stirrups have a diameter of 8 mm, which facilitates the installation of pressure sensors. According to the size requirements of the sensors, the spacing between two steel bars near the sensors is adjusted to 17 cm.

[0065] Table 2 Design parameters of the hollow pier Bridge pier Solid Outer diameter / m 1.2 Inner diameter / m 0.63 Height / m 2 Outer vertical reinforcement diameter / mm 25 Inner vertical reinforcement diameter / mm 12 Total length of outer vertical reinforcement / m 37.8 Total length of inner vertical reinforcement / m 33.6 Hoop reinforcement diameter / mm 8 Total length of hoop reinforcement / m 53.04 According to the research on the action mechanism of the prestressed steel wire ropes, the layout spacing of the steel wire rope cables 8 is set to 20 cm.

[0066] Table 3 Dimension design table of the anchor 21 Model 26 specification 22 specification Total length / mm 435 435 Total width / mm 336 250 Total height / mm 257 252 Hole opening size / mm Diameter 60 Diameter 58 Maximum center distance between two holes / mm 225 225 The dimension specifications of the anchor 21 are divided into 26 specifications and 22 specifications.

[0067] Table 4 Measurement content and layout Project Solid bridge pier Hollow bridge pier Number of steel wire rope cables / piece 6 6 Number of reinforcing bar strain gauges / piece 16 8 Pressure sensors / piece 3 3 Magnetic flux sensors / piece 3 3 A magnetic flux sensor is nested and installed on the surface of the steel wire rope cable 8 (the installation position needs to be grooved on the surface of the pier model 1 in advance) to measure the prestress loss during the tensioning process.

[0068] Selection of the specifications of the steel wire rope cable 8: 6×36WS steel core wire rope, nominal diameter φ26 mm, strength 1870 MPa, nominal breaking force 450 kN.

[0069] 6×36WS steel core wire rope, nominal diameter Φ22 mm, strength 1770 MPa, nominal breaking force 305 kN.

[0070] Reference Figure 16 The following is a schematic diagram of the analysis results of the 1 / 4 finite element model of the solid cylinder of the pier model 1 shown in: Through finite element analysis, the magnitude of the load required to reinforce the pier model 1 with the prestressed steel wire rope cables 8 is clarified. When the single-ring prestress acts on structures such as piers, the internal stress will be affected by the vertical direction of the structure; to explore the effect of the single-ring prestress on the structure, finite element analysis is carried out; a 1 / 4 finite element model of a solid cylinder with a height of 5 m and a diameter of 2 m is established, and a circumferential uniform pressure is applied at the middle position of the column. Based on the size of the steel wire rope cables 8 used, the loading width is determined to be 20 mm and the pressure is 10 MPa, and the column body material uses C50 concrete.

[0071] Reference Figures 16 - 20 , Figure 16 In (a) is the 1 / 4 finite element model diagram, (b) is the radial stress diagram of the loading plane, and (c) is the circumferential stress diagram of the loading plane; Figure 17 The following is the analysis diagram of the radial stress distribution in the vertical direction, Figure 18The figure in the middle is the analysis diagram of the circumferential stress distribution in the vertical direction; the finite element analysis results show that, compared with the plane structure, when a single-ring uniformly distributed load acts on the cylindrical structure, the stress in the loading section is weakened to a certain extent, and shows non-uniform distribution, gradually weakening towards the center of the circle. At the same time, the stress will be transmitted along the vertical direction, and as it moves away from the loading position, the transmitted stress becomes smaller and smaller. Considering the need for reinforcement, the circumferential stress at the edge of the structure plays an important role.

[0072] It should be noted that Figure 16 and Figure 17 S11 in represents the stress in the X-axis direction. A positive value indicates tensile stress, and a negative value indicates compressive stress; Figure 16 and Figure 18 S22 in represents the stress in the Y-axis direction. A positive value indicates tensile stress, and a negative value indicates compressive stress; Figure 20 S33 in represents the stress in the Z-axis direction. A positive value indicates tensile stress, and a negative value indicates compressive stress.

[0073] Figures 16 - 18 CSYS-1 in represents the coordinate system represented by the equal identifier in the finite element analysis software; Coordinate Systems (abbreviated as CSYS).

[0074] Figures 16 - 18 and Figure 20 The average in: 75% represents the average stress threshold; the blue area in the figure represents the part with smaller stress, and the yellow and red represent the parts with larger stress; as Figure 16 "e-03" in represents multiplying by 10 to the power of negative 3; "e-01" represents multiplying by 10 to the power of negative 1; "e+00" represents multiplying by 10 to the power of 0; and so on; among them, "e" is a representation method in scientific notation in finite element analysis, representing "multiplying by 10 to the power of".

[0075] When a single-ring uniformly distributed load of 10 MPa acts, the circumferential compressive stress at the edge of the loading plane is 3.43 MPa. As it moves away from the loading position, the stress rapidly decreases on both sides; when the distance from the loading position is 15 mm, the circumferential stress at the edge has dropped to 1.16 MPa, and when the distance from the loading position is 100 mm, the stress has dropped to 0.2 MPa, and the effect is very weak; referring to Figure 19 As shown in, when the circumferential prestress is loaded, a tensile stress along the vertical direction will be generated at the outer edge of the structure.

[0076] It can be seen from the analysis results that the generated vertical tensile stress is not greater than 0.5 MPa.

[0077] Change the load to 8MPa, 6MPa, 4MPa, and 2MPa respectively; the stress distribution is the same as that under the 10MPa load, indicating that the stress distribution is independent of the load magnitude; the maximum value of the circumferential compressive stress at the edge is shown in Table 4 of the finite element results for different loads.

[0078] Table 5 Finite Element Results for Different Loads Uniform load 10 MPa 8 MPa 6 MPa 4 MPa 2 MPa Maximum circumferential compressive stress at edge 3.43 MPa 2.73 MPa 2.1 MPa 1.36 MPa 0.68 MPa Since the standard value of the tensile strength of C50 concrete is 2.65MPa, to inhibit the generation of vertical through cracks in the pier, the circumferential stress at the outer edge of the structure should not be less than 2.65MPa; considering the data in Table 5 and the effect of interval reinforcement, the effective uniform load should not be less than 10MPa.

[0079] Test procedure: Prepare 8 wire rope cables with a diameter of 26mm and 8 wire rope cables with a diameter of 22mm. The two specifications of wire rope cables are divided into initial tensioning and formal tensioning; in the case of initial tensioning, both specifications of wire rope cables are tensioned step by step in units of 10KN to 50KN; in the case of formal tensioning, the wire rope cables with a diameter of 26mm are loaded step by step in units of 10KN to 300KN; the wire rope cables with a diameter of 22mm are loaded step by step in units of 10KN to 200KN.

Claims

1. A method for tensioning a prestressed anchor cable, characterized in that, It includes the following steps: S101. First, tension the anchor cable, prepare the pier model (1), and set the wire rope cable (8) on the pier model (1). The wire rope cable (8) is annularly distributed on the outer periphery of the pier model (1). S102. Arrange the sensor assembly. The sensor assembly includes a magnetic flux sensor (3), a pressure sensor (5), an axial steel bar strain gauge (10), a radial steel bar strain gauge (11), a circumferential steel bar strain gauge (12), and a strain sensor (13) installed on the pier model (1). Reserve type-C grooves (6) at different positions on the surface of the pier model (1), and install a reserved intelligent adjustment device (7) in the type-C grooves (6). S103. Tension the wire rope cable (8) to the design force F, and measure the tensile force, internal stress, and surface stress of the pier model (1) through the sensor assembly. S104. Connect the control system. The control system includes a control device (14). The control device (14) controls the intelligent adjustment device (7) to adjust the tightness of the wire rope cable (8). The control device (14) includes a display screen and a control chip.

2. A prestressed anchor cable tensioning method according to claim 1, characterized in that: There is a type-A groove (2) reserved on the outer surface of the pier model (1), and the type-A groove (2) is used for installing the magnetic flux sensor (3). There is a type-B groove (4) provided on the outer surface of the pier model (1), and the pressure sensor (5) is installed in the type-B groove (4). The pier model (1) includes axial steel bars, radial steel bars, and circumferential steel bars. The axial steel bar strain gauge (10), the radial steel bar strain gauge (11), and the circumferential steel bar strain gauge (12) are respectively installed on the axial steel bars, radial steel bars, and circumferential steel bars. A plurality of strain sensors (13) are installed and attached to the surface of the pier model (1). Measure the tensile force FC of the wire rope cable (8) wound at different positions on the surface of the pier model (1) through the magnetic flux sensor (3), measure the normal pressure FY of the wire rope cable (8) wound at different positions on the surface of the pier model (1) through the pressure sensor (5), respectively measure the axial internal stress FN10, radial internal stress FN11, and circumferential internal stress FN12 of the pier reinforcement by the wire rope cable (8) through the axial steel bar strain gauge (10), radial steel bar strain gauge (11), and circumferential steel bar strain gauge (12) on the surfaces of the axial steel bars, radial steel bars, and circumferential steel bars, and measure the surface stress FB of the concrete at different positions on the surface of the pier model (1) where the wire rope cable (8) is wound through the strain sensor (13).

3. A device for tensioning prestressed anchor cables, characterized in that: Applicable to the prestressed anchor cable tensioning method described in any one of claims 1-2, one end of the pressure sensor (5) is fixedly provided with an embedded plate (16), the other end is rotatably provided with a rotating disc (17), and an arc-shaped guide plate (15) is slidably arranged on the rotating disc (17). When the wire rope cable (8) is annularly distributed on the outer periphery of the pier model (1), the wire rope cable (8) moves through the arc-shaped guide plate (15).

4. The device for tensioning a prestressed anchor cable according to claim 3, characterized in that: A cable head rod (18) is fixedly arranged at the end of the steel wire rope cable (8). The surface of the cable head rod (18) is smooth. A threaded rod (19) is arranged at one end of the cable head rod (18) far away from the steel wire rope cable (8). A threaded cap (20) is connected to the threaded rod (19) by thread fit.

5. The device for tensioning a prestressed anchor cable according to claim 4, characterized in that: The intelligent adjusting device (7) includes an anchor (21). The anchor (21) is of a trapezoidal block structure. One side of the anchor (21) that is movably attached to the outer surface of the pier model (1) is an arc surface. Threaded fixing holes (22) are arranged on both sides of the upper and lower surfaces of the anchor (21). Circular holes (23) are arranged on both sides of the anchor (21). The circular holes (23) penetrate through the trapezoidal inclined surface of the anchor (21). When fixing the steel wire rope cable (8), the cable head rod (18) and the threaded rod (19) at the end of the steel wire rope cable (8) are movably passed through the circular hole (23), and the end of the threaded rod (19) extending out of the circular hole (23) is limited by the threaded cap (20).

6. The device for tensioning a prestressed anchor cable according to claim 5, characterized in that: The intelligent adjusting device (7) further includes a positioning base plate (24), a first sliding plate (25), a second sliding plate (26) and a positioning clamping plate (27). The positioning base plate (24), the first sliding plate (25) and the second sliding plate (26) are arranged in sequence. The first sliding plate (25) and the second sliding plate (26) are fixedly connected by a support connecting rod (34). A guiding support rod (29) is fixedly arranged on the positioning base plate (24). The guiding support rod (29) movably passes through the first sliding plate (25) and the second sliding plate (26). One end of the guiding support rod (29) movably passing through the first sliding plate (25) and the second sliding plate (26) is fixedly connected to the positioning clamping plate (27). The positioning clamping plates (27) are arranged in pairs up and down. The positioning clamping plate (27) is of an L-shaped structure. A threaded fixing rod (28) is connected to the positioning clamping plate (27) by thread fit. When it is necessary to tighten the steel wire rope cable (8), a pair of positioning clamping plates (27) are respectively clamped at the same side corners of the upper and lower surfaces of the anchor (21), and then the threaded fixing rod (28) is rotated so that the threaded fixing rod (28) is fixed in the threaded fixing hole (22).

7. The device for tensioning a prestressed anchor cable according to claim 6, characterized in that: A rotating member (32) is rotatably arranged on the second sliding plate (26). A threaded fixing sleeve (33) is fixedly arranged at the end of the rotating member (32). The rotating member (32) is operated so that the threaded fixing sleeve (33) is connected to the end of the threaded rod (19) by thread fit.

8. The device for tensioning a prestressed anchor cable according to claim 7, characterized in that: An electric oil pump type jack (30) is fixedly arranged on the positioning base plate (24). The telescopic end of the electric oil pump type jack (30) is fixedly connected to the first sliding plate (25).

9. The device for tensioning a prestressed anchor cable according to claim 5, characterized in that: The outer surface of the cable head rod (18) and the inner wall of the circular hole (23) are both smooth.

10. A device for tensioning a prestressed anchor cable according to claim 5, characterized in that: The steel wire rope cables (8) are arranged in pairs, and the two ends of the two steel wire rope cables (8) are simultaneously connected to an anchor (21). An annular sleeve is rotatably sleeved on the outer circle of the cable head rod (18), and the annular sleeve is movably attached to the inner wall of the circular hole (23).

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