Displacement measuring device and method for foundation anchor rod anti-drawing test

Abstract

The invention discloses a displacement measuring device and method for a foundation anchor rod anti-pulling test, and relates to the technical field of foundation anchor rod anti-pulling tests.The displacement measuring device comprises a buttress, a cross beam is fixedly connected to the top face of the buttress, and a center hole jack is installed on the top face of the cross beam; the device has the advantages that the reading of the stay wire displacement sensor can eliminate the influence of the descending of the buttress, so that the reading of the stay wire displacement sensor can always represent the pulling-resistant displacement of the foundation anchor rod, and the pulling-resistant displacement of the foundation anchor rod can be accurately measured. Meanwhile, according to the principle, the influence of elastic deformation of the cross beam can be eliminated, measurement errors are avoided, other displacement sensors are not needed to measure the sinking distance and the elastic deformation quantity, the measurement value does not need to be calculated, the anti-pulling displacement of the foundation anchor rod can be visually reflected, the use amount of the sensors is reduced, and the cost investment is reduced. The damage probability of the device is reduced, and the measurement efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of foundation anchor pull-out test, in particular to a displacement measuring device and a measuring method for foundation anchor pull-out test. Background Art

[0002] The foundation anchor rod mainly bears the buoyancy of groundwater and the vertical upward (pull-out) load generated by the horizontal load of the building. The foundation anchor rod is usually a permanent anchor rod with a long service life and is concealed. Its action mechanism is similar to that of the pull-out pile.

[0003] The foundation anchor pull-out device is generally composed of a reaction force device, a pressure device and a displacement measuring device. Among them, the commonly used displacement measuring devices are mainly dial indicators and electronic displacement meters. The dial indicator converts the displacement of the anchor into the rotation of the pointer through mechanical transmission, and reads the displacement value on the dial. The electronic displacement meter uses a sensor to convert the displacement signal into an electrical signal for measurement. The disadvantage of this displacement measuring device is that it is particularly dependent on the reference beam, and the site is complex and changeable. The reference beam is susceptible to interference, resulting in measurement errors. At the same time, the accuracy of the dial indicator is greatly affected by human reading errors, and it is easy to misread in low light and vibration environments. In addition, its range is limited, and it may not be able to accurately measure when the anchor displacement is large. Although the electronic displacement meter has relatively high accuracy, it is susceptible to electromagnetic interference in complex construction site environments. At the same time, high-precision electronic displacement meters are expensive and costly, which increases the test cost. In addition, the installation and debugging process is cumbersome, takes a lot of time, and reduces the test efficiency.

[0004] After searching, Chinese patent application CN104480977A discloses a rock anchor foundation pullout load test device. Although it realizes in-situ measurement of the full pullout load-displacement curve of the rock anchor foundation of the transmission tower, and has a simple structure and convenient assembly and disassembly, it realizes the miniaturization and lightweight of the in-situ pullout test device. However, during the pullout test of the foundation anchor, the measuring device will be subjected to force, thereby squeezing the ground, causing the ground to sag, and then causing the measuring device to move downward relative to the foundation anchor. At this time, to maintain the tension of the foundation anchor, the through-hole jack will be further extended. At this time, the measured displacement data cannot represent the pullout displacement of the foundation anchor, resulting in measurement error. At the same time, the through-hole jack will exert reverse pressure on the beam of the device, causing elastic deformation of the beam, further affecting the measurement of the pullout displacement of the foundation anchor. If other displacement sensors are used to measure the sinking distance and elastic deformation, a complex calculation process is required, which cannot intuitively reflect the pullout displacement of the foundation anchor. This not only increases the number of sensors used, increases the investment cost, and increases the probability of device damage, but also increases the calculation process and reduces measurement efficiency. Summary of the Invention

[0005] The object of the present invention is to provide a displacement measuring device and a measuring method for a foundation anchor pull-out test.

[0006] In order to solve the problems raised in the above background technology, the present invention provides the following technical solutions: a displacement measuring device for foundation anchor pull-out test, comprising a pier, the top surface of the pier is fixedly connected to a crossbeam, the top surface of the crossbeam is installed with a through-hole jack, the output end of the through-hole jack is fixedly connected to a pressure plate, the pressure plate is sleeved with a force transmission connecting rod, one end of the force transmission connecting rod is meshed and sleeved with an upper threaded lock, the other end of the force transmission connecting rod is meshed and sleeved with a lower threaded lock, and a connecting plate is sleeved on the force transmission connecting rod, the four sides of the connecting plate are sleeved with exposed steel bars of the anchor rod, the top end of the exposed steel bars of the anchor rod is meshed and sleeved with a sub-lock, the outer surface of the through-hole jack is fixedly connected to an auxiliary beam, the end of the auxiliary beam is fixedly connected to a first pull box, the output end of the first pull box is fixedly connected to a base, and a second pull box is installed between the auxiliary beam and the pressure plate; The output end of the second wire pull box is sleeved with a first fixed block, the end of the first fixed block is fixedly connected to one end of the first pull rope, the other end of the first pull rope is fixedly connected to the sliding platform, and the outer surface of the first pull rope is slidably sleeved with the first guide wheel, the bottom surface of the sliding platform is slidably sleeved with a guide rail, the top surface of the sliding platform is provided with a slide groove, the slide groove is sleeved with a slider, the top of the slider is fixedly connected to a wire displacement sensor, the output end of the first wire pull box is sleeved with a second fixed block, the end of the second fixed block is fixedly connected to one end of the second pull rope, the other end of the second pull rope is fixedly connected to the moving block, and the outer surface of the second pull rope is slidably sleeved with the second guide wheel The cam is secured to the upper and lower ends of the gears and is secured to a central position within the gear train of the driver and the control wheel, and the cam is secured to the lower and lower ends of the gear train.

[0007] As a further solution of the present invention: there are two piers, and the two piers are symmetrically arranged with respect to the bisecting plane of the crossbeam, a through hole is opened on the crossbeam, the force transmission connecting rod is sleeved with the through hole, and there are two auxiliary beams, and the two auxiliary beams are located on both sides of the crossbeam.

[0008] As a further solution of the present invention: the base is fixed to the ground by anchor bolts, and the first pull box and the second pull box are both arranged vertically.

[0009] As a further solution of the present invention: the first guide wheel is fixedly connected to the top surface of the crossbeam, the guide rail is fixedly connected to the top surface of the crossbeam, the cross-sections of the guide rail, slide groove and slider are all T-shaped, the wire displacement sensor is fixedly connected to the crossbeam, and the output end of the wire displacement sensor is fixedly connected to the slider.

[0010] As a further solution of the present invention: the second guide wheel and the third guide wheel are both rotatably connected to the auxiliary beam, the bracket is fixedly connected to the cross beam, and the bracket is L-shaped, the guide rod is socketed with the moving block, a first inner cavity is opened in the slider, the driving gear and the driven gear are both rotatably socketed with the first inner cavity, the screw rod is socketed with the slider, and both ends of the screw rod are fixedly connected to the end face of the slide groove, and the driving gear is socketed with the embedded groove.

[0011] As a further solution of the present invention: a second inner cavity is provided in the first fixed block and the second fixed block, a rotating rod is rotatably sleeved on the top wall of the second inner cavity, the end of the rotating rod is fixedly connected to a transmission bevel gear, the outer surface of the transmission bevel gear is meshedly connected to a limiting bevel gear, a screw is fixedly connected to the central axis of the limiting bevel gear, and the outer surface of the screw is meshedly sleeved with a retaining ring.

[0012] As a further solution of the present invention: the clamping ring is slidably sleeved with the second inner cavity, and the clamping ring is in contact with and connected to the output ends of the first wire drawing box and the second wire drawing box.

[0013] A displacement measurement method for foundation anchor pull-out test: The specific steps of the displacement measurement method for foundation anchor pull-out test are as follows: S1. Place the buttress and crossbeam on both sides of the exposed anchor bars, and pass the exposed anchor bars through the adapter plate. Then, rotate the sub-locking device so that the sub-locking device cooperates with the lower threaded lock to tighten the adapter plate, thereby integrating the force-transmitting connecting rod, adapter plate, and exposed anchor bars into a whole, and fixing the base to the ground. S2. Fix the first fixing block to the output end of the second pull box, fix the second fixing block to the output end of the first pull box, start the through-hole jack, and finally read the displacement of the foundation anchor pull-out test through the pull wire displacement sensor on the beam.

[0014] Adopting the above technical solution: Compared with the prior art, the beneficial effects of the present invention are: The present invention drives the end of the second pull rope to move synchronously through the output end of the first pull rope box, so that the end of the second pull rope rises, so that the other end of the second pull rope is released, and then the second pull rope moves under the rebound of the reset spring, so that the second pull rope drives the roller to rotate, so that the rotating shaft on the roller drives the active bevel gear to rotate, so that the active bevel gear drives the driven bevel gear to rotate, and then the transmission shaft on the driven bevel gear drives the active gear to rotate through the embedded groove, so that the active gear drives the driven gear to rotate, and the screw rod on the driven gear is fixedly connected to the slide groove, so that the driven gear It rotates and translates on the screw rod, and at the same time the driven gear is socketed with the slider, so that the translation of the driven gear drives the slider to approach the wire displacement sensor, which reduces the reading of the wire displacement sensor. The displacement of the slider relative to the sliding table is the rising displacement of the output end of the first wire box, which is also the depth of the synchronous descent of the pier, beam and through-hole jack. Therefore, the reading of the wire displacement sensor can eliminate the influence of the descent of the pier, so that the reading of the wire displacement sensor can always represent the pull-out displacement of the foundation anchor rod. At the same time, according to the above principle, the influence of the elastic deformation of the beam can also be eliminated, avoiding measurement errors.

[0015] The present invention directly responds to the pull-out displacement of the foundation anchor rod through two symmetrically distributed wire displacement sensors. There is no need to use other displacement sensors to measure the sinking distance and elastic deformation, nor is there any need to calculate the measurement value. The pull-out displacement of the foundation anchor rod can be intuitively reflected, which not only reduces the use of sensors, reduces the cost investment, reduces the probability of device damage, but also improves measurement efficiency.

[0016] The wire displacement sensor of the present invention is in non-direct contact with the force transmission connecting rod and the exposed steel bars of the anchor rod, avoiding the installation of the wire displacement sensor on the force transmission connecting rod and the exposed steel bars of the anchor rod, thereby avoiding the separation of the measuring surface and the wire displacement sensor probe, and avoiding sudden changes in the displacement value. At the same time, the use of the non-direct contact method of the wire displacement sensor can reduce measurement errors, making the measurement data more reliable, true and accurate, and can effectively solve the technical pain points of displacement measurement in foundation anchor pull-out resistance detection, thereby promoting technological innovation in this field. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall structure of a displacement measuring device for foundation anchor pull-out test according to the present invention; Figure 2 A half-section schematic diagram of a pressure plate structure in an embodiment of the present invention; Figure 3 In the embodiment of the present invention Figure 2 A magnified view of the structure of part A; Figure 4 In the embodiment of the present invention Figure 2 A magnified view of the structure of part B; Figure 5In the embodiment of the present invention Figure 2 A magnified view of the structure of part C in the middle; Figure 6 Schematic diagram of the sliding platform structure in an embodiment of the present invention; Figure 7 A half-section schematic diagram of the sliding platform structure in an embodiment of the present invention; Figure 8 In the embodiment of the present invention Figure 7 A magnified view of the structure of part D in the middle; Figure 9 It is a half-section schematic diagram of the second fixing block structure in an embodiment of the present invention.

[0018] In the figure: 1. Pier; 2. Crossbeam; 3. Through-hole jack; 4. Bearing plate; 5. Auxiliary beam; 6. Upper threaded lock; 7. Force-transmitting connecting rod; 8. Lower threaded lock; 9. Connecting plate; 10. Anchor rod exposed steel bar; 11. Sub-lock; 13. First drawstring box; 14. Base; 15. Second drawstring box; 16. First fixing block; 17. Second fixing block; 18. First drawstring; 19. Second drawstring; 20. Sliding table; 21. First guide wheel; 22. Guide rail; 23. Slide; 24. Slider ; 25. Wire displacement sensor; 26. Second guide wheel; 27. Third guide wheel; 28. Roller; 29. Moving block; 30. Reset spring; 31. Bracket; 32. Guide rod; 33. Rotating shaft; 34. Driving bevel gear; 35. Driven bevel gear; 36. Transmission shaft; 37. Groove; 38. Driving gear; 39. Driven gear; 40. Screw; 41. First inner cavity; 42. Second inner cavity; 43. Rotating rod; 44. Transmission bevel gear; 45. Limiting bevel gear; 46. Screw; 47. Snap ring. DETAILED DESCRIPTION

[0019] The following is a further description of specific embodiments of the present invention in conjunction with the accompanying drawings. It should be noted that the description of these embodiments is intended to facilitate understanding of the present invention and does not constitute a limitation of the present invention. In addition, the technical features involved in the various embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other. Example 1

[0020] See also Figure 1 、 Figure 2 and Figure 4-Figure 8The present invention provides a technical solution: a displacement measuring device for foundation anchor pull-out test, a first fixed block 16 is sleeved on the output end of the second pull box 15, the end of the first fixed block 16 is fixedly connected to one end of the first pull rope 18, the other end of the first pull rope 18 is fixedly connected to the sliding platform 20, and the outer surface of the first pull rope 18 is slidably sleeved with a first guide wheel 21, the bottom surface of the sliding platform 20 is slidably sleeved with a guide rail 22, a slide groove 23 is provided on the top surface of the sliding platform 20, a slider 24 is sleeved in the slide groove 23, and a pull wire displacement sensor 25 is fixedly connected to the top of the slider 24, a second fixed block 17 is sleeved on the output end of the first pull box 13, the end of the second fixed block 17 is fixedly connected to one end of the second pull rope 19, the other end of the second pull rope 19 is fixedly connected to the moving block 29, and the second pull rope 19 The outer surface of the second guide wheel 26, the third guide wheel 27 and the roller 28 are slidably sleeved. One end of the return spring 30 is fixedly connected to the side wall of the moving block 29, and the other end of the return spring 30 is fixedly connected to the bracket 31. The side wall of the bracket 31 is fixedly connected to the guide rod 32, and the top of the bracket 31 is rotatably sleeved with a rotating shaft 33. One end of the rotating shaft 33 is fixedly connected to the roller 28, and the other end of the rotating shaft 33 is fixedly connected to the driving bevel gear 34. The outer surface of the driving bevel gear 34 is meshed with the driven bevel gear 35. The central axis of the driven bevel gear 35 is fixedly connected to the transmission shaft 36. The outer surface of the transmission shaft 36 is provided with an embedding groove 37, and the transmission shaft 36 is sleeved with a driving gear 38. The outer surface of the driving gear 38 is meshed with the driven gear 39, and the central axis of the driven gear 39 is meshed with a screw rod 40.

[0021] See also Figure 1 and Figure 4-Figure 6 The first guide wheel 21 is fixedly connected to the top surface of the beam 2, the guide rail 22 is fixedly connected to the top surface of the beam 2, the cross-sections of the guide rail 22, the slide groove 23 and the slider 24 are all T-shaped, the wire displacement sensor 25 is fixedly connected to the beam 2, and the output end of the wire displacement sensor 25 is fixedly connected to the slider 24.

[0022] See also Figure 2 、 Figure 4 、 Figure 5 and Figure 8 The second guide wheel 26 and the third guide wheel 27 are both rotatably connected to the auxiliary beam 5, the bracket 31 is fixedly connected to the crossbeam 2, and the bracket 31 is L-shaped, the guide rod 32 is sleeved with the moving block 29, and a first inner cavity 41 is opened in the slider 24, the driving gear 38 and the driven gear 39 are both rotatably sleeved with the first inner cavity 41, the screw rod 40 is sleeved with the slider 24, and both ends of the screw rod 40 are fixedly connected to the end face of the slide groove 23, and the driving gear 38 is engaged with the embedded groove 37.

[0023] Specifically, during the foundation anchor pull-out test, when the through-hole jack 3 applies an upward thrust to the pressure plate 4, its bottom will apply an equal magnitude of reverse pressure to the beam 2, thereby causing the pier 1 on the beam 2 to squeeze the ground, causing the ground to sink, and then causing the pier 1, beam 2 and through-hole jack 3 to drop synchronously, while the pier 1 is far away from the exposed steel bars 10 of the anchor rod, and the ground around the exposed steel bars 10 of the anchor rod does not sink, so the through-hole jack 3 and the pressure plate 4 move closer to the exposed steel bars 10 of the anchor rod. In order to keep the force on the force-transmitting connecting rod 7 unchanged, the through-hole jack 3 will be extended again while maintaining the same thrust. , and its length is extended again to the depth of the pier 1's descent. At this time, the output end of the second cable box 15 on the pressure plate 4 is further extended. According to the above process, the reading of the cable displacement sensor 25 can no longer represent the pull-out displacement of the foundation anchor. It should be further explained that as the pier 1, the beam 2 and the through-hole jack 3 descend synchronously, the position of the base 14 fixed to the ground remains unchanged, that is, the base 14 rises relative to the auxiliary beam 5, that is, the output end of the first cable box 13 on the auxiliary beam 5 rises, and the end of the second cable 19 moves synchronously with the output end of the first cable box 13, so that the end of the second cable 19 rises, making The other end of the second pull rope 19 is released, and the second pull rope 19 moves under the rebound of the return spring 30, so that the second pull rope 19 drives the roller 28 to rotate, so that the rotating shaft 33 on the roller 28 drives the active bevel gear 34 to rotate, so that the active bevel gear 34 drives the driven bevel gear 35 to rotate, and then the transmission shaft 36 on the driven bevel gear 35 drives the active gear 38 to rotate through the embedded groove 37, so that the active gear 38 drives the driven gear 39 to rotate, and the screw rod 40 on the driven gear 39 is fixedly connected to the slide groove 23, so that the driven gear 39 rotates and translates on the screw rod 40, and at the same time, the driven gear The wheel 39 is sleeved on the slider 24, so that the translation of the driven gear 39 drives the slider 24 to approach the wire displacement sensor 25, so that the reading of the wire displacement sensor 25 decreases, and the displacement of the slider 24 relative to the sliding table 20 is the rising displacement of the output end of the first wire box 13, which is also the depth of the synchronous descent of the pier 1, the beam 2 and the through-hole jack 3. Therefore, the reading of the wire displacement sensor 25 can eliminate the influence of the descent of the pier 1, so that the reading of the wire displacement sensor 25 can always represent the pull-out displacement of the foundation anchor rod. At the same time, according to the above principle, the influence of the elastic deformation of the beam 2 can also be eliminated, thereby avoiding measurement errors. Example 2

[0024] See also Figures 1-4The present invention provides a technical solution: a displacement measuring device for foundation anchor pull-out test, comprising a pier 1, a crossbeam 2 fixedly connected to the top surface of the pier 1, a through-hole jack 3 installed on the top surface of the crossbeam 2, a pressure plate 4 fixedly connected to the output end of the through-hole jack 3, a force transmission connecting rod 7 sleeved on the pressure plate 4, one end of the force transmission connecting rod 7 is engaged and sleeved with an upper threaded lock 6, the other end of the force transmission connecting rod 7 is engaged and sleeved with a lower threaded lock 8, and a connecting plate 9 is sleeved on the force transmission connecting rod 7, and the connecting plate 9 is sleeved with exposed anchor steel bars 10 around the connecting plate 9, and the top of the exposed anchor steel bars 10 is engaged and sleeved with a sub-locker 11, an auxiliary beam 5 is fixedly connected to the outer surface of the through-hole jack 3, and a first pull box 13 is fixedly connected to the end of the auxiliary beam 5, a base 14 is fixedly connected to the output end of the first pull box 13, and a second pull box 15 is installed between the auxiliary beam 5 and the pressure plate 4.

[0025] See also Figure 2 There are two piers 1, and the two piers 1 are symmetrically arranged about the bisecting plane of the beam 2. A through hole is opened on the beam 2, and the force transmission connecting rod 7 is connected to the through hole. There are two auxiliary beams 5, and the two auxiliary beams 5 are located on both sides of the beam 2.

[0026] See also Figure 2 and Figure 4 The base 14 is fixed to the ground by anchor bolts, and the first pull box 13 and the second pull box 15 are both vertically arranged.

[0027] Specifically, during the pull-out test of the foundation anchor rod, the pull-out displacement of the foundation anchor rod can be directly reflected by two symmetrically distributed wire displacement sensors 25. There is no need to use other displacement sensors to measure the sinking distance and elastic deformation, and there is no need to calculate the measurement value. The pull-out displacement of the foundation anchor rod can be intuitively reflected, which not only reduces the use of sensors, reduces the cost investment, reduces the probability of device damage, but also improves measurement efficiency. Example 3

[0028] See also Figure 4 and Figure 9 The present invention provides a technical solution: a displacement measuring device for foundation anchor pull-out test, wherein a second inner cavity 42 is opened in the first fixed block 16 and the second fixed block 17, and a rotating rod 43 is rotatably sleeved on the top wall of the second inner cavity 42, and the end of the rotating rod 43 is fixedly connected to a transmission bevel gear 44, and the outer surface of the transmission bevel gear 44 is meshedly connected to a limiting bevel gear 45, and a screw 46 is fixedly connected to the central axis of the limiting bevel gear 45, and a retaining ring 47 is meshedly sleeved on the outer surface of the screw 46.

[0029] See also Figure 9 The snap ring 47 is slidably connected to the second inner cavity 42, and the snap ring 47 is in contact with the output ends of the first pull wire box 13 and the second pull wire box 15.

[0030] Specifically, during the installation of the wire displacement sensor 25, the wire displacement sensor 25 is not in direct contact with the force transmission connecting rod 7 and the exposed steel bars 10 of the anchor rod, thereby avoiding the installation of the wire displacement sensor 25 on the force transmission connecting rod 7 and the exposed steel bars 10 of the anchor rod, thereby avoiding the separation of the measuring surface and the probe of the wire displacement sensor 25, and avoiding sudden changes in the displacement value. At the same time, the use of the non-direct contact method of the wire displacement sensor 25 can reduce measurement errors, making the measurement data more reliable, true and accurate, and can effectively solve the technical pain points of displacement measurement in foundation anchor pull-out resistance detection, thereby promoting technological innovation in this field.

[0031] The working principle and use process of the present invention are as follows: when it is necessary to measure the pull-out displacement of the foundation anchor, the pier 1 and the crossbeam 2 are placed on both sides of the exposed steel bars 10 of the anchor, and the exposed steel bars 10 of the anchor are passed through the connecting plate 9. At this time, the sub-locking device 11 is rotated so that the sub-locking device 11 cooperates with the lower threaded locking device 8 to tighten the connecting plate 9, thereby making the force transmission connecting rod 7, the connecting plate 9 and the exposed steel bars 10 of the anchor become a whole. At the same time, the base 14 is fixed to the ground, and then the first fixing block 16 and the second fixing block 16 are rotated. The rotating rod 43 on the second fixed block 17 causes the transmission bevel gear 44 on the rotating rod 43 to drive the limiting bevel gear 45 to rotate, thereby causing the screw 46 on the limiting bevel gear 45 to rotate, and the clamping ring 47 on the screw 46 is limited by the second inner cavity 42 and cannot rotate, so that the clamping ring 47 is driven by the screw 46 to move horizontally, and then the clamping ring 47 cooperates with the second fixed block 17 to squeeze the output end of the first pull box 13, so that the end of the second pull rope 19 is aligned with the output end of the first pull box 13. The first locking nut 16 is pressed against the support 14 and the second locking nut 16 is pressed against the support 14, and the second locking nut 16 is pressed against the support 14. The second locking nut 16 is pressed against the support 14 and the second locking nut 16 is pressed against the support 14. When the output end of the second wire pulling box 15 moves, the end of the first pull rope 18 that moves synchronously with the output end of the second wire pulling box 15 moves, so that the first pull rope 18 pulls the sliding table 20 to move horizontally under the guidance of the first guide wheel 21, and the slide groove 23 on the sliding table 20 drives the driven gear 39 to move synchronously through the screw rod 40, so that the slider 24 outside the driven gear 39 moves synchronously with the sliding table 20, so that the slider 24 drives the output end of the wire displacement sensor 25 to move. At this time, the reading of the wire displacement sensor 25 is the pull-out displacement of the foundation anchor rod; During the above process, when the through-hole jack 3 applies an upward thrust to the pressure plate 4, its bottom will apply an equal amount of reverse pressure to the crossbeam 2, so that the pier 1 on the crossbeam 2 squeezes the ground, causing the ground to sink, and then the pier 1, crossbeam 2 and through-hole jack 3 drop synchronously, while the pier 1 is far away from the exposed steel bars 10 of the anchor rod, and the ground around the exposed steel bars 10 of the anchor rod does not sink, so the through-hole jack 3 and the pressure plate 4 move closer to the exposed steel bars 10 of the anchor rod. In order to keep the force on the force transmission connecting rod 7 unchanged, the through-hole jack 3 will be extended again while maintaining the same thrust, and its extended length is the depth of the pier 1 falling. At this time, the output end of the second pull box 15 on the pressure plate 4 is further extended. According to the above process, the reading of the pull displacement sensor 25 can no longer represent the pull-out displacement of the foundation anchor rod; It should be further explained that, as the pier 1, the crossbeam 2 and the through-hole jack 3 descend synchronously, the position of the base 14 fixed to the ground remains unchanged, that is, the base 14 rises relative to the auxiliary beam 5, that is, the output end of the first pull box 13 on the auxiliary beam 5 rises, and the end of the second pull rope 19 moves synchronously with the output end of the first pull box 13, so that the end of the second pull rope 19 rises, so that the other end of the second pull rope 19 is released, and then the second pull rope 19 moves under the rebound of the reset spring 30, so that the second pull rope 19 drives the roller 28 to rotate, so that the rotating shaft 33 on the roller 28 drives the active bevel gear 34 to rotate, so that the active bevel gear 34 drives the driven bevel gear 35 to rotate, and then the transmission shaft 36 on the driven bevel gear 35 drives the active gear 38 to rotate through the embedded groove 37, so that the active bevel gear 34 drives the driven bevel gear 35 to rotate. The driven gear 38 drives the driven gear 39 to rotate, and the screw rod 40 on the driven gear 39 is fixedly connected to the slide groove 23, so that the driven gear 39 rotates and translates on the screw rod 40, and at the same time the driven gear 39 is sleeved with the slider 24, so that the translation of the driven gear 39 drives the slider 24 to approach the wire displacement sensor 25, so that the reading of the wire displacement sensor 25 decreases, and the displacement of the slider 24 relative to the sliding table 20 is the displacement of the output end of the first wire box 13, that is, the depth of the synchronous descent of the pier 1, the beam 2 and the through-hole jack 3, so that the reading of the wire displacement sensor 25 can eliminate the influence of the descent of the pier 1, so that the reading of the wire displacement sensor 25 can always represent the pull-out displacement of the foundation anchor rod, and at the same time, according to the above principle, the influence of the elastic deformation of the beam 2 can also be eliminated, thereby avoiding measurement errors; In summary, the pull-out displacement of the foundation anchor rod can be directly reflected by two symmetrically distributed wire displacement sensors 25, without the need to use other displacement sensors to measure the sinking distance and elastic deformation, and without the need to calculate the measurement value. The pull-out displacement of the foundation anchor rod can be intuitively reflected, which not only reduces the use of sensors, reduces the investment cost, reduces the probability of device damage, but also improves measurement efficiency. At the same time, the wire displacement sensor 25 is not in direct contact with the force transmission connecting rod 7 and the exposed steel bars 10 of the anchor rod, avoiding the installation of the wire displacement sensor 25 on the force transmission connecting rod 7 and the exposed steel bars 10 of the anchor rod, thereby avoiding the separation of the measuring surface and the probe of the wire displacement sensor 25, and avoiding sudden changes in the displacement value. At the same time, the use of the non-direct contact method of the wire displacement sensor 25 can reduce measurement errors, making the measurement data more reliable, true and accurate, and can effectively solve the technical pain points of displacement measurement in foundation anchor pull-out resistance detection, thereby promoting technological innovation in this field and completing the operation.

[0032] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. It is apparent to those skilled in the art that various changes, modifications, substitutions, and variations to these embodiments may be made without departing from the principles and spirit of the present invention, and these changes and modifications still fall within the scope of protection of the present invention.

Claims

1. A displacement measuring device for foundation anchor pull-out test, characterized in that: The invention comprises a pier (1), the top surface of the pier (1) is fixedly connected to a crossbeam (2), the top surface of the crossbeam (2) is installed with a through-hole jack (3), the output end of the through-hole jack (3) is fixedly connected to a pressure plate (4), the pressure plate (4) is sleeved with a force transmission connecting rod (7), one end of the force transmission connecting rod (7) is engaged with an upper threaded lock (6), the other end of the force transmission connecting rod (7) is engaged with a lower threaded lock (8), and the force transmission connecting rod (7) is sleeved with a A connecting plate (9), wherein the connecting plate (9) is provided with exposed anchor rod steel bars (10) on all sides, and the top end of the exposed anchor rod steel bars (10) is engaged with a sub-locking device (11), the outer surface of the through-hole jack (3) is fixedly connected to an auxiliary beam (5), the end of the auxiliary beam (5) is fixedly connected to a first wire box (13), the output end of the first wire box (13) is fixedly connected to a base (14), and a second wire box (15) is installed between the auxiliary beam (5) and the pressure plate (4); The output end of the second wire pulling box (15) is sleeved with a first fixed block (16), the end of the first fixed block (16) is fixedly connected to one end of the first pull rope (18), the other end of the first pull rope (18) is fixedly connected to the sliding platform (20), and the outer surface of the first pull rope (18) is slidably sleeved with a first guide wheel (21), the bottom surface of the sliding platform (20) is slidably sleeved with a guide rail (22), the top surface of the sliding platform (20) is provided with a slide groove (23), the slide groove (23) is sleeved with a slider (24), the top of the slider (24) is fixedly connected to a wire pulling displacement sensor (25), the output end of the first wire pulling box (13) is sleeved with a second fixed block (17), the end of the second fixed block (17) is fixedly connected to one end of the second pull rope (19), the other end of the second pull rope (19) is fixedly connected to a moving block (29), and the outer surface of the second pull rope (19) is slidably sleeved with a second guide wheel (26), a third guide wheel (26), and a third guide wheel (25). The guide wheel (27) and the roller (28) are fixedly connected to one end of a return spring (30) on the side wall of the moving block (29), and the other end of the return spring (30) is fixedly connected to a bracket (31). The side wall of the bracket (31) is fixedly connected to a guide rod (32), and the top end of the bracket (31) is rotatably sleeved with a rotating shaft (33), one end of the rotating shaft (33) is fixedly connected to the roller (28), and the other end of the rotating shaft (33) is fixedly connected to the active bevel gear ( 34), the outer surface of the driving bevel gear (34) is meshedly connected with the driven bevel gear (35), the central axis of the driven bevel gear (35) is fixedly connected with a transmission shaft (36), the outer surface of the transmission shaft (36) is provided with an embedding groove (37), and the transmission shaft (36) is sleeved with a driving gear (38), the outer surface of the driving gear (38) is meshedly connected with the driven gear (39), and the central axis of the driven gear (39) is meshedly sleeved with a screw rod (40).

2. A displacement measuring device for foundation anchor pullout test according to claim 1, characterized in that: There are two piers (1), and the two piers (1) are symmetrically arranged with respect to the bisecting plane of the crossbeam (2). A through hole is provided on the crossbeam (2), and the force transmission connecting rod (7) is sleeved with the through hole. There are two auxiliary beams (5), and the two auxiliary beams (5) are located on both sides of the crossbeam (2).

3. The displacement measuring device for foundation anchor pullout test according to claim 1, characterized in that: The base (14) is fixed to the ground via anchor bolts, and the first wire draw box (13) and the second wire draw box (15) are both arranged vertically.

4. The displacement measuring device for foundation anchor pullout test according to claim 1, characterized in that: The first guide wheel (21) is fixedly connected to the top surface of the crossbeam (2), the guide rail (22) is fixedly connected to the top surface of the crossbeam (2), the cross-sections of the guide rail (22), the slide groove (23) and the slider (24) are all T-shaped, the wire displacement sensor (25) is fixedly connected to the crossbeam (2), and the output end of the wire displacement sensor (25) is fixedly connected to the slider (24).

5. The displacement measuring device for foundation anchor pullout test according to claim 1, characterized in that: The second guide wheel (26) and the third guide wheel (27) are both rotatably connected to the auxiliary beam (5), the bracket (31) is fixedly connected to the cross beam (2), and the bracket (31) is L-shaped. The guide rod (32) is sleeved with the moving block (29), and a first inner cavity (41) is provided in the slider (24). The driving gear (38) and the driven gear (39) are both rotatably sleeved with the first inner cavity (41), the screw rod (40) is sleeved with the slider (24), and both ends of the screw rod (40) are fixedly connected to the end surface of the slide groove (23), and the driving gear (38) is engaged with the embedded groove (37).

6. The displacement measuring device for foundation anchor pullout test according to claim 1, characterized in that: A second inner cavity (42) is provided in each of the first fixed block (16) and the second fixed block (17). A rotating rod (43) is rotatably sleeved on the top wall of the second inner cavity (42). The end of the rotating rod (43) is fixedly connected to a transmission bevel gear (44). The outer surface of the transmission bevel gear (44) is meshingly connected to a limiting bevel gear (45). A screw (46) is fixedly connected to the central axis of the limiting bevel gear (45). The outer surface of the screw (46) is meshingly sleeved with a retaining ring (47).

7. The displacement measuring device for foundation anchor pullout test according to claim 6, characterized in that: The clamping ring (47) is slidably sleeved with the second inner cavity (42), and the clamping ring (47) is in contact with and connected to the output ends of the first wire drawing box (13) and the second wire drawing box (15).

8. A displacement measurement method for foundation anchor pullout test, characterized by: The specific steps of the displacement measurement method of the foundation anchor pull-out test are as follows: S1. Place the pier (1) and the crossbeam (2) on both sides of the exposed steel bar (10) of the anchor rod, and make the exposed steel bar (10) of the anchor rod pass through the connecting plate (9). Then, rotate the sub-locking device (11) so that the sub-locking device (11) cooperates with the lower threaded locking device (8) to tighten the connecting plate (9), thereby making the force transmission connecting rod (7), the connecting plate (9) and the exposed steel bar (10) of the anchor rod become a whole, and at the same time fix the base (14) on the ground; S2. Fix the first fixed block (16) to the output end of the second wire box (15), fix the second fixed block (17) to the output end of the first wire box (13), start the through-hole jack (3), and finally read the displacement of the foundation anchor rod pull-out test through the wire displacement sensor (25) on the beam (2).

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