Steel strand stress deviation experimental device and use method

Abstract

A steel strand stress deviation experiment device comprises a counter-force support, a first continuous jack and a second continuous jack are oppositely arranged at the two ends of the counter-force support, a monitoring mechanism is arranged in the counter-force support and used for being connected with a steel strand, and preformed holes are formed in the axial direction of the first continuous jack and the second continuous jack and used for allowing the steel strand to penetrate through. The first continuous jack and the second continuous jack are connected with a hydraulic pump station, and the monitoring mechanism and the hydraulic pump station are connected with a control unit. According to the steel strand stress deviation experimental device and the using method, continuous jack equipment on site is used as a power source, special equipment such as a press machine test bed does not need to be additionally purchased, and cost is saved; different pre-tightening forces can be applied to a plurality of steel strands at the same time for detection, and the monitoring results of the plurality of steel strands are independent, so that the accuracy, universality and accuracy of experimental data are ensured.

Description

Technical Field

[0001] The invention relates to the field of steel strand force deviation detection, and in particular to a steel strand force deviation test device and a use method. Background Art

[0002] Continuous jacks are construction equipment that provide stable power during the lifting, pushing, horizontal and vertical rotation of large structures. The main function of the continuous jack is to fix the installation base plate on the reaction platform, and use high-strength, low-relaxation steel strands as traction rigging. The steel strands move with the heavy components. In the load-bearing system, the load is borne by several steel strands. To ensure construction safety, the loads of each steel strand must be balanced so that they do not exceed the strength limit.

[0003] Generally speaking, when the load of the steel strand in the same oil cylinder is switched between the upper and lower anchors, the relative slip between the steel strand and the anchor hole is different due to the different loads, and the extension of the steel strand itself is also different, which will make the load of the steel strand gradually approach a balanced state. Therefore, when loading for the first time, the initial force deviation of the steel strand becomes the key to safety control. If the initial pre-tightening is not sufficient, a large force deviation will occur during the loading process, causing some steel strands to exceed the load limit, the clips to collapse, and affect construction safety.

[0004] Therefore, it is necessary to pre-tighten each steel strand before formal loading.

[0005] At present, the conventional pre-tightening method is to adjust the lower clamping anchor to a pre-loose state so that the steel strands passing through the lower clamping anchor can only move in one direction in the tensioning direction, and then pre-tighten the steel strands one by one through external force (hand chain hoist or crane, etc.) / or its own oil cylinder (main top with pre-tightening anchor plate). Such methods require repeated operations and are inefficient. The pre-tightening force control range is mainly based on visual inspection to observe whether the steel strands are straight. The pre-tightening force is not controlled, and the effect of the pre-tightening force on the force deviation of the steel strands is unclear. Therefore, it is necessary to conduct a test experiment on the effect of the force deviation of the steel strands.

[0006] The common microcomputer-controlled steel strand relaxation testing machines on the market can perform stress tests on a single steel strand. However, when multiple steel strands are loaded simultaneously in the same cylinder, the stress deviation between the steel strands cannot be detected, and thus the impact of the stress deviation on the steel strand cannot be experimentally detected. Summary of the invention

[0007] The main purpose of the present invention is to provide a steel strand stress deviation test device and a use method to solve the problem of inconvenience in testing multiple steel strands.

[0008] In order to solve the above technical problems, the technical solution adopted by the present invention is: A steel strand force deviation test device comprises a reaction force bracket, a first continuous jack and a second continuous jack are arranged at two opposite ends of the reaction force bracket, a monitoring mechanism is arranged inside the reaction force bracket, the monitoring mechanism is used to connect the steel strand, and a reserved hole is arranged along the axial direction of the first continuous jack and the second continuous jack for the steel strand to pass through; The first continuous jack and the second continuous jack are connected to a hydraulic pump station, and the monitoring mechanism and the hydraulic pump station are connected to a control unit.

[0009] In a preferred solution, the number of monitoring mechanisms is equal to the number of steel strands to be measured, the steel strand is cut into two sections, the two sections of the steel strand are respectively connected to the first continuous jack and the second continuous jack, and the two ends of the monitoring mechanism are connected to the two sections of the same steel strand.

[0010] In a preferred solution, the first continuous jack includes a first main top oil cylinder, one end of the first main top oil cylinder is provided with a first guide frame, the first guide frame is provided with a first upper clamping anchor connected to the output end of the first main top oil cylinder, the first upper clamping anchor is used for clamping and loosening the steel strand, the other end of the first main top oil cylinder is provided with a first base connected to the reaction support, the first base is provided with a first lower clamping anchor, the first lower clamping anchor is used for clamping and loosening the steel strand; The second continuous jack includes a second main top oil cylinder, a second guide frame is provided at one end of the second main top oil cylinder, a second upper clamping anchor connected to the output end of the second main top oil cylinder is provided in the second guide frame, a pre-tightening anchor plate is provided on the side of the second upper clamping anchor away from the second main top oil cylinder, a second base connected to the reaction support is provided at the other end of the second main top oil cylinder, a second lower clamping anchor is provided in the second base, and the second lower clamping anchor is used for clamping and loosening the steel strand; An axial through hole is provided in the first master oil cylinder and the second master oil cylinder, and the reserved hole includes the axial through hole.

[0011] In a preferred solution, the first upper clamping anchor, the first lower clamping anchor, the second upper clamping anchor and the second lower clamping anchor all include a secondary oil cylinder connected to a hydraulic pump station, a secondary oil cylinder piston is arranged in the secondary oil cylinder, a clamping anchor plate is arranged at the output end of the secondary oil cylinder piston, and a limit plate is arranged on the side of the clamping anchor plate away from the secondary oil cylinder; A plurality of clip holes are arranged in the clamping anchor plate, two clips are arranged in the clip holes, and the two clips are arranged opposite to each other for clamping the steel strand. The clip holes are conical, and a plurality of through holes are arranged in the limiting plate. An axial through hole is arranged at the end of the auxiliary oil cylinder and in the piston of the auxiliary oil cylinder, and the reserved holes include the axial through hole, the clip hole and the through hole.

[0012] In a preferred solution, the preload anchor plate includes a plate body, the plate body is connected to the limit plate through a second bolt and a second nut, and the second bolt passes through the plate body and the limit plate; A plurality of jacket holes are arranged in the disc body, and jackets are arranged in the jacket holes; The jacket hole is conical, the jacket is matched with the jacket hole, the jacket is an elastic jacket, and a plurality of openings are arranged at one end of the jacket with a larger diameter, and the jacket is used for passing the steel strand through and clamping the steel strand; The reserved holes include the jacket holes.

[0013] In a preferred solution, a plurality of support blocks are provided on one side of the disk body away from the limit plate, a fixed plate is connected to the support block on one side away from the limit plate through a threaded rod and a third nut, the threaded rod is connected to the support block, the threaded rod passes through the fixed plate, the third nut is threadedly connected to the threaded rod, a plurality of mounting holes are provided in the fixed plate, an electromagnet is provided in the mounting hole, a permanent magnet is provided in the jacket, the permanent magnet is close to the electromagnet, and the electromagnet is electrically connected to the control unit; A plug sleeve is provided on one side of the fixing plate close to the limiting plate, and the plug sleeve is used to prop open the part of the jacket with an opening, and the steel strand can pass through the plug sleeve and the mounting hole, and the reserved hole includes the mounting hole.

[0014] In a preferred solution, the monitoring mechanism includes a tension sensor and two threaded columns connected to the tension sensor, the threaded column is connected to a connecting plate, the connecting plate is connected to a mounting plate through a connecting structure, a chuck is provided in the mounting plate, and the steel strand passes through the chuck; A tapered hole is provided in the mounting plate, and the outer peripheral surface of the chuck is adapted to the tapered hole; The tension sensor is connected to the control unit via the sensor acquisition module; The connection structure includes: A first bolt and a first nut, the first bolt passes through the connecting plate and the mounting plate, and the first nut is threadedly connected with the first bolt.

[0015] or The mounting plate is hinged with a plurality of connecting rods through a hinge shaft, the connecting rods are connected with connecting blocks, the connecting plate is connected with a fixed block, a limit block is provided on the side of the fixed block, a limit groove matched with the limit block is provided in the connecting plate, the limit block is located in the limit groove, and a tension spring is provided between the plurality of connecting rods.

[0016] A method for using a steel strand force deviation test device comprises the following steps: S1. Two sections of steel strands are connected through a monitoring mechanism. The tension sensor in the monitoring mechanism is connected to a sensor acquisition module through a cable. A pre-tightening anchor plate is provided in one of the continuous jacks. S2. Cut the steel strand into two sections. Pass the two sections of the steel strand through the reserved holes in two consecutive jacks respectively and finally meet in the reaction support. The two sections of the same steel strand correspond to each other. S3, connecting the two sections of steel strands through a monitoring mechanism, and connecting the tension sensor in the monitoring mechanism to a sensor acquisition module through a cable; S4, the steel strand is connected to the first upper clamping anchor, the first lower clamping anchor and the second lower clamping anchor, and is clamped to apply a pre-tightening force; S5, the second main top cylinder works to apply different preload forces to each strand; S6. After the pre-tightening operation of each steel strand, the second main top oil cylinder is retracted, so that the force of the steel strand is transferred to the second lower clamping anchor; S7, the first main jacking cylinder works, the tension sensor detects the tension signal, the sensor acquisition module receives the tension signal and transmits it to the control unit, and the control unit records the force change of each steel strand; S8. When the stroke of the first main top cylinder reaches the maximum value or the force on one of the steel strands reaches 100kN, the action stops, and the influence of different initial preload forces of the steel strands on the overall tensioning force deviation is analyzed.

[0017] In a preferred solution, S5 also includes: S51, connecting one of the steel strands to the pre-tightening anchor plate; S52, the second main top oil cylinder works, drives the pre-tightening anchor plate to move a certain distance and then stops, and then connects the second steel strand to the pre-tightening anchor plate; S53, the second main top oil cylinder continues to work, driving the pre-tightening anchor plate to move a certain distance and then stop, and then connects the third steel strand to the pre-tightening anchor plate; S54, repeating steps S52-S53 until all used steel strands are connected to the pre-tightening anchor plate; Among them, the second main top cylinder monitors the pre-tightening force of different steel strands in real time when working. The pre-tightening force of the steel strands is detected by the tension sensor and the signal is transmitted to the control unit. The difference in pre-tightening force of different steel strands is 0.1-10kN.

[0018] In a preferred solution, in S5, the steps of connecting the steel strand and the pre-tightening anchor plate are as follows: S501, start the electromagnet to attract the permanent magnet and drive the jacket to approach the fixed plate; S502, when connecting the steel strands, marking the tension sensor and the electromagnet connected to the same steel strand through the control unit; S503, presetting the preload force required for each steel strand; S504, when the tension sensor corresponding to one of the steel strands detects that the tension reaches the pre-tightening force, the corresponding electromagnet is started to reverse its magnetic field; S505. The electromagnet pushes the permanent magnet to return the jacket to the jacket hole. Under the action of the jacket hole, the opening of the jacket is tightened to clamp the steel strand.

[0019] The present invention provides a steel strand force deviation test device and a method for using the same. By adopting the above scheme, the following beneficial effects are achieved: 1. Use the continuous jack equipment on site as the power source, eliminating the need to purchase additional special equipment such as press test benches, thus saving costs.

[0020] 2. It is capable of testing multiple steel strands at the same time, and the monitoring results of multiple steel strands are independent, thus ensuring the accuracy and universality of the experimental data.

[0021] 3. Apply different preload forces to multiple steel strands and then conduct unified testing to simulate the actual working environment and make the experimental data more accurate.

[0022] 4. The process of applying different preload forces to multiple steel strands is carried out automatically, which is simple to operate, more efficient and more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described below in conjunction with the accompanying drawings and embodiments: Figure 1 It is a structural schematic diagram of a steel strand force deviation test device and a method of use of the present invention; Figure 2 It is a schematic diagram of the structure of the monitoring mechanism of the present invention; Figure 3 It is a schematic diagram of the structure of an embodiment of the monitoring mechanism of the present invention; Figure 4 is a schematic structural diagram of the first lower clamping anchor, the first upper clamping anchor and the second lower clamping anchor of the present invention; Figure 5 is a schematic structural diagram of the second upper clamping anchor of the present invention; Figure 6 is a schematic structural diagram of the pre-tightening anchor plate of the present invention; Figure 7 It is a schematic diagram of the structure of the jacket of the present invention; Figure 8 is a physical schematic diagram of the first continuous jack and the second continuous jack of the present invention; Fig. 9 It is a physical connection diagram of the monitoring mechanism of the present invention; Fig.10 It is a schematic diagram of the physical connection of the reaction support described in the present invention.

[0024] In the figure: Steel strand 1, first main top oil cylinder 201, first guide frame 202, first upper clamping anchor 203, first base 204, first lower clamping anchor 205, second main top oil cylinder 301, second guide frame 302, second upper clamping anchor 303, second base 304, second lower clamping anchor 305, pre-tightening anchor plate 306, plate body 361, second bolt 362, second nut 363, jacket hole 364, jacket 365, support block 371, fixing plate 372, threaded rod 373, third nut 374, electromagnet 375, plug sleeve 376, permanent Magnet 377, reaction force bracket 4, monitoring mechanism 5, tension sensor 501, threaded column 502, connecting plate 503, mounting plate 504, chuck 505, first bolt 511, first nut 512, connecting rod 521, hinge shaft 522, connecting block 523, fixing block 524, limit block 525, tension spring 526, sensor acquisition module 61, control unit 62, hydraulic pump station 63, auxiliary cylinder 701, auxiliary cylinder piston 702, clamping anchor plate 703, limit plate 704, clip hole 705, clip 706, through hole 707. DETAILED DESCRIPTION

[0025] Embodiment 1: like Figure 1 As shown, a steel strand force deviation test device comprises a reaction support 4, a first continuous jack and a second continuous jack are arranged at two opposite ends of the reaction support 4, a monitoring mechanism 5 is arranged inside the reaction support 4, the monitoring mechanism 5 is used to connect the steel strand 1 and detect the tension of the steel strand 1, and a reserved hole is arranged along the axial direction of the first continuous jack and the second continuous jack for the steel strand 1 to pass through, and the steel strand 1 refers to the steel strand to be tested; The first continuous jack and the second continuous jack are connected to the hydraulic pump station 63, and the monitoring mechanism 5 and the hydraulic pump station 63 are connected to the control unit 62; the hydraulic pump station 63 can be a hydraulic oil control device commonly used in existing oil pumps, and the existing technology is used to control the oil inlet and outlet; the control unit 62 can also use existing control equipment, such as a PLC, PLD or CPU control unit. The first continuous jack and the second continuous jack can use existing equipment, and there is no need to purchase additional special equipment such as a press test bench, thereby saving costs.

[0026] In the preferred solution, the number of monitoring mechanisms 5 is equal to the number of measured steel strands 1, the steel strand 1 is cut into two sections, the two sections of the steel strand 1 are respectively connected to the first continuous jack and the second continuous jack, and the two ends of the monitoring mechanism 5 are connected to the two sections of the same steel strand 1.

[0027] When in use, the steel strand 1 to be tested is first cut into two sections to ensure that the cross-section is flat, and then the two sections of the steel strand 1 are respectively passed through the reserved holes of the first continuous jack and the second continuous jack, and the cross-sections are brought close to each other, and then connected using a monitoring mechanism 5. The tensile force applied to the steel strand 1 is detected in real time through the monitoring mechanism 5. One steel strand 1 corresponds to one monitoring mechanism 5, which ensures the accuracy of the detection and facilitates the simultaneous detection of multiple steel strands 1 to ensure the accuracy of the detection results; the impact of the force deviation of multiple steel strands is accurately obtained.

[0028] In the present application, the steel strand 1 is cut into two sections to ensure that the tested steel strand belongs to the same steel strand, thereby ensuring the accuracy of the test result; as needed, two different steel strands 1 can also be used to connect the first continuous jack and the second continuous jack respectively.

[0029] In a further embodiment, Figure 1 As shown, the first continuous jack includes a first main top oil cylinder 201, one end of the first main top oil cylinder 201 is provided with a first guide frame 202, the first guide frame 202 is provided with a first upper clamping anchor 203 connected to the output end of the first main top oil cylinder 201, the first upper clamping anchor 203 is used for clamping and loosening the steel strand 1, the other end of the first main top oil cylinder 201 is provided with a first base 204 connected to the reaction support 4, the first base 204 is provided with a first lower clamping anchor 205, the first lower clamping anchor 205 is used for clamping and loosening the steel strand 1; The second continuous jack includes a second main top oil cylinder 301, one end of the second main top oil cylinder 301 is provided with a second guide frame 302, the second guide frame 302 is provided with a second upper clamping anchor 303 connected to the output end of the second main top oil cylinder 301, the second upper clamping anchor 303 is provided with a pre-tightening anchor plate 306 on the side away from the second main top oil cylinder 301, the other end of the second main top oil cylinder 301 is provided with a second base 304 connected to the reaction support 4, the second base 304 is provided with a second lower clamping anchor 305, and the second lower clamping anchor 305 is used for clamping and loosening the steel strand 1; Axial through holes are provided in the first master oil cylinder 201 and the second master oil cylinder 301 , and the reserved holes include axial through holes.

[0030] When the steel strand 1 is connected to the first continuous jack, the steel strand 1 passes through the first guide frame 202, the first upper clamping anchor 203, the axial through hole of the first main top oil cylinder 201 and the first lower clamping anchor 205 in sequence and then enters the reaction support 4; When the steel strand 1 is connected to the second continuous jack, the steel strand 1 passes through the second guide frame 302, the preload anchor plate 306, the second upper clamping anchor 303, the axial through hole of the second main top oil cylinder 301 and the second lower clamping anchor 305 in sequence and then enters the reaction support 4.

[0031] In a further embodiment, Figure 1 and 4 As shown, the first upper clamping anchor 203, the first lower clamping anchor 205, the second upper clamping anchor 303 and the second lower clamping anchor 305 all include a secondary oil cylinder 701 connected to the hydraulic pump station 63, a secondary oil cylinder piston 702 is arranged in the secondary oil cylinder 701, a clamping anchor plate 703 is arranged at the output end of the secondary oil cylinder piston 702, and a limiting plate 704 is arranged on the side of the clamping anchor plate 703 away from the secondary oil cylinder 701; A plurality of clip holes 705 are provided in the clamping anchor plate 703, two clips 706 are provided in the clip holes 705, and the two clips 706 are arranged opposite to each other for clamping the steel strand 1. The clip holes 705 are conical, and a plurality of through holes 707 are provided in the limiting plate 704; An axial through hole is provided at the end of the auxiliary cylinder 701 and in the auxiliary cylinder piston 702 , and the reserved holes include the axial through hole, the clip hole 705 and the through hole 707 .

[0032] When the steel strand 1 passes through the first upper clamping anchor 203, the first lower clamping anchor 205, the second upper clamping anchor 303 or the second lower clamping anchor 305, it needs to pass through the axial through hole, the clip hole 705 and the through hole 707; When clamping, the auxiliary oil cylinder 701 drives the auxiliary oil cylinder piston 702 to extend, driving the clamping anchor plate 703 to approach the limit plate 704, the limit plate 704 blocks the clip 706, the clip 706 enters the clip hole 705, and is subjected to the contraction force under the action of the clip hole 705, the clip 706 approaches the steel strand 1, and the steel strand 1 is clamped; During relaxation, the auxiliary cylinder 701 drives the auxiliary cylinder piston 702 to retract, driving the clamping anchor plate 703 away from the limit plate 704. Under the action of friction, the clamp 706 follows the steel strand 1 and remains relatively still. The clamp 706 moves away from the clamp hole 705 and is no longer subjected to the contraction force, thus completing the relaxation of the steel strand 1.

[0033] In the preferred embodiment, Figure 1 and 2 As shown, the monitoring mechanism 5 includes a tension sensor 501 and two threaded columns 502 connected to the tension sensor 501, the threaded column 502 is connected to a connecting plate 503, the connecting plate 503 is connected to a mounting plate 504 through a connecting structure, the mounting plate 504 is provided with a clamp 505, and the steel strand 1 passes through the clamp 505; The mounting plate 504 is provided with a tapered hole, and the outer peripheral surface of the chuck 505 is adapted to the tapered hole, and the chuck 505 is a spring chuck; When in use, the end of the steel strand 1 is passed through the tapered hole and the chuck 505, and then the chuck 505 is pushed into the tapered hole. The chuck 505 receives a contraction force under the action of the tapered hole, thereby clamping the steel strand 1. The connecting plate 503 is then connected through the connecting structure to complete the connection between the steel strand 1 and the monitoring mechanism 5. The operation is simple and the connection is convenient.

[0034] The tension sensor 501 is connected to the control unit 62 via the sensor acquisition module 61. The tension sensor 501 can be an existing one. The existing method is used to detect tension and transmit the tension signal to the acquisition module 61. The acquisition module 61 is an existing sensor signal acquisition device. The connection structure includes a first bolt 511 and a first nut 512 . The first bolt 511 passes through the connection plate 503 and the mounting plate 504 . The first nut 512 is threadedly connected to the first bolt 511 .

[0035] During connection, the first bolt 511 is passed through the connecting plate 503 and the mounting plate 504 and then connected to the first bolt 511 using the first nut 512. This process is repeated to complete the connection of multiple first nuts 512 with the first bolt 511, and the installation of the connecting plate 503 and the mounting plate 504 is completed.

[0036] Embodiment 2: like Figure 3 As shown, the connection structure includes a mounting plate 504 hinged with a plurality of connecting rods 521 through a hinge shaft 522, the connecting rods 521 are connected to a connecting block 523, the connecting plate 503 is connected to a fixed block 524, a limit block 525 is provided on the side of the fixed block 524, a limit groove matched with the limit block 525 is provided in the connecting plate 503, the limit block 525 is located in the limit groove, and tension springs 526 are provided between the plurality of connecting rods 521. The number of the connecting rods 521 is preferably two or four, and they are arranged opposite to each other in pairs. A tension spring 526 is arranged between two opposite connecting rods 521, and there is a gap between different tension springs 526.

[0037] When connecting, place the connecting plate 503 and the mounting plate 504 opposite to each other, and then move them closer to each other so that the fixing block 524 is against the connecting block 523, and then forcefully move the connecting plate 503 and the mounting plate 504 closer to each other, so that a component force is generated at the connection between the fixing block 524 and the connecting block 523 to counteract the pulling force of the tension spring 526, so that the connecting block 523 and the connecting rod 521 can be rotated until the limit block 525 moves to the position of the limit groove, and the connecting block 523 and the connecting rod 521 are pulled back under the action of the pulling force of the tension spring 526, so that the limit block 525 can enter the limit groove to complete the connection; if needed, the connecting block 523 and the connecting rod 521 can also be manually rotated; the operation is simple, the connection is convenient, the connection efficiency is increased, and the connection of multiple steel strands 1 is convenient.

[0038] Embodiment 3: like Figure 5 , 6As shown in FIG. 7 , the second upper clamping anchor 303 is not provided with a clip 706 , and the preload anchor plate 306 includes a plate body 361 , and the plate body 361 is connected to the limiting plate 704 through a second bolt 362 and a second nut 363 , and the second bolt 362 passes through the plate body 361 and the limiting plate 704 ; A plurality of jacket holes 364 are provided in the disc body 361, and a jacket 365 is provided in the jacket hole 364; The jacket hole 364 is conical, and the jacket 365 is matched with the jacket hole 364. The jacket 365 is an elastic jacket, and a plurality of openings are provided at one end of the jacket 365 with a larger diameter. The jacket 365 is used for the steel strand 1 to pass through and clamp the steel strand 1. The reserved holes include the jacket hole 364 .

[0039] When the steel strand 1 is connected to the second upper clamping anchor 303 , the steel strand 1 also passes through the jacket hole 364 and the jacket 365 . The structure of the jacket 365 can refer to the existing spring clamp. The jacket 365 is subjected to a contraction force in the jacket hole 364 to clamp the steel strand 1 .

[0040] In the preferred embodiment, a plurality of support blocks 371 are provided on one side of the disk body 361 away from the limiting plate 704. A fixed plate 372 is connected to the support block 371 on one side away from the limiting plate 704 through a threaded rod 373 and a third nut 374. The threaded rod 373 is connected to the support block 371. The threaded rod 373 passes through the fixed plate 372. The third nut 374 is threadedly connected to the threaded rod 373. A plurality of mounting holes are provided in the fixed plate 372. An electromagnet 375 is provided in the mounting hole. A permanent magnet 377 is provided in the jacket 365. The permanent magnet 377 is close to the electromagnet 375. The electromagnet 375 is electrically connected to the control unit 62. A plug sleeve 376 is provided on one side of the fixing plate 372 close to the limiting plate 704. The plug sleeve 376 is used to open the portion of the jacket 365 where an opening is provided. The steel strand 1 can pass through the plug sleeve 376 and the mounting hole. The reserved hole includes the mounting hole.

[0041] When in use, the electromagnet 375 is started, and the electromagnet 375 generates a magnetic field in an existing manner, and the magnetic poles are arranged radially, so as to attract the permanent magnet 377, drive the jacket 365 to approach the fixed plate 372, and then when the steel strand 1 is connected, the tension sensor 501 and the electromagnet 375 connected to the same steel strand 1 are marked by the control unit 62. When the tension sensor 501 corresponding to the steel strand 1 detects that the tension reaches the pre-tightening force, the corresponding electromagnet 375 is started to reverse its magnetic field, thereby reversing the magnetic poles, and then the permanent magnet 377 can be pushed to make the jacket 365 return to the jacket hole 364. Under the action of the jacket hole 364, the opening part of the jacket 365 is tightened, and the clamping of the steel strand 1 can be completed; when clamping is not needed, the electromagnet is turned off; The connection between the steel strand 1 and the pre-tightening anchor plate 306 is controlled by the electromagnet 375, and manual connection and control are not required. This is not only simple to operate, but also more efficient and labor-intensive. The clamping timing is automatically controlled, which is more accurate.

[0042] Embodiment 4: A method for using a steel strand force deviation test device comprises the following steps: S1, two sections of steel strands 1 are connected through a monitoring mechanism 5, the tension sensor 501 in the monitoring mechanism 5 is connected to the sensor acquisition module 61 through a cable, and a pre-tightening anchor plate 306 is provided in one of the continuous jacks; S2, cutting the steel strand 1 into two sections, the two sections of the steel strand 1 respectively pass through the reserved holes in two consecutive jacks, and finally merge in the reaction support 4, and the two sections of the same steel strand 1 correspond to each other one by one; S3, connecting the two sections of steel strands 1 through the monitoring mechanism 5, and connecting the tension sensor 501 in the monitoring mechanism 5 to the sensor acquisition module 61 through a cable; S4, the steel strand 1 is connected to the first upper clamping anchor 203, the first lower clamping anchor 205 and the second lower clamping anchor 305, and is clamped to apply a pre-tightening force; S5, the second main top oil cylinder 301 works to apply different pre-tightening forces to each steel strand 1; S6. After the pre-tightening operation of each steel strand, the second main top oil cylinder 301 is retracted, so that the force of the steel strand 1 is transferred to the second lower clamping anchor 305; S7, the first main oil cylinder 201 works, the tension sensor 501 detects the tension signal, the sensor acquisition module 61 receives the tension signal and transmits it to the control unit 62, and the control unit 62 records the force change of each steel strand; S8. When the stroke of the first main top cylinder 201 reaches the maximum value or the force on one of the steel strands reaches 100kN, the action stops, and the influence of different initial preload forces of the steel strands on the overall tensioning force deviation is analyzed.

[0043] The above method can complete the detection of a single or multiple steel strands 1 as required, the detection result is more accurate, and the structure used can be selected on site, without the need to purchase additional special equipment such as a press test bench, thereby saving costs.

[0044] In a preferred solution, S5 also includes: S51, connecting one of the steel strands 1 to the pre-tightening anchor plate 306; S52, the second main top oil cylinder 301 works, drives the pre-tightening anchor plate 306 to move a certain distance and then stops, and then connects the second steel strand 1 to the pre-tightening anchor plate 306; S53, the second main top oil cylinder 301 continues to work, driving the pre-tightening anchor plate 306 to move a certain distance and then stop, and then the third steel strand 1 is connected to the pre-tightening anchor plate 306; S54, repeating steps S52-S53 until all the used steel strands 1 are connected to the pre-tightening anchor plate 306; Among them, the second main top cylinder 301 monitors the pre-tightening force of different steel strands 1 in real time when working. The pre-tightening force of the steel strands 1 is detected by the tension sensor 501 and the signal is transmitted to the control unit 62. The difference in pre-tightening force of different steel strands 1 is 0.1-10kN.

[0045] Applying different preloads to multiple steel strands and then testing them uniformly can make the experimental data more accurate and provide a clearer understanding of the impact of force deviations on multiple steel strands.

[0046] In a preferred solution, in S5, the steps of connecting the steel strand 1 and the pre-tightening anchor plate 306 are as follows: S501, start the electromagnet 375 to attract the permanent magnet 377, and drive the jacket 365 to approach the fixed plate 372; S502, when connecting the steel strand 1, marking the tension sensor 501 and the electromagnet 375 connected to the same steel strand 1 through the control unit 62; S503, presetting the preload force required for each steel strand 1; S504, when the tension sensor 501 corresponding to one of the steel strands 1 detects that the tension reaches the pre-tightening force, the corresponding electromagnet 375 is started to reverse its magnetic field; S505, the electromagnet 375 pushes the permanent magnet 377 to make the jacket 365 return to the jacket hole 364, and under the action of the jacket hole 364, the opening part of the jacket 365 is tightened to clamp the steel strand 1.

[0047] The timing for connecting the steel strand 1 to the pre-tightening anchor plate 306 is automatically selected and the connection is automatically performed, which has a higher connection efficiency and does not require manual connection.

[0048] The above embodiments are only preferred technical solutions of the present invention and should not be regarded as limiting the present invention. The protection scope of the present invention shall be the technical solutions recorded in the claims, including equivalent replacement solutions of the technical features in the technical solutions recorded in the claims. That is, equivalent replacement improvements within this scope are also within the protection scope of the present invention.

Claims

1. A steel strand force deviation test device, characterized by: It comprises a reaction support (4), a first continuous jack and a second continuous jack are arranged at opposite ends of the reaction support (4), a monitoring mechanism (5) is arranged inside the reaction support (4), the monitoring mechanism (5) is used to connect the steel strand (1), and a reserved hole is arranged along the axial direction of the first continuous jack and the second continuous jack for the steel strand (1) to pass through; The first continuous jack and the second continuous jack are connected to a hydraulic pump station (63), and the monitoring mechanism (5) and the hydraulic pump station (63) are connected to a control unit (62).

2. According to claim 1, a steel strand force deviation test device is characterized by: The number of monitoring mechanisms (5) is equal to the number of the steel strands (1) to be tested. The steel strand (1) is cut into two sections. The two sections of the steel strand (1) are respectively connected to a first continuous jack and a second continuous jack. The two ends of the monitoring mechanism (5) are connected to the two sections of the same steel strand (1).

3. The steel strand force deviation test device according to claim 1 is characterized in that: The first continuous jack comprises a first main top oil cylinder (201), one end of the first main top oil cylinder (201) is provided with a first guide frame (202), the first guide frame (202) is provided with a first upper clamping anchor (203) connected to the output end of the first main top oil cylinder (201), the first upper clamping anchor (203) is used to clamp and loosen the steel strand (1), the other end of the first main top oil cylinder (201) is provided with a first base (204) connected to the reaction support (4), the first base (204) is provided with a first lower clamping anchor (205), the first lower clamping anchor (205) is used to clamp and loosen the steel strand (1); The second continuous jack comprises a second main top oil cylinder (301), a second guide frame (302) is provided at one end of the second main top oil cylinder (301), a second upper clamping anchor (303) connected to the output end of the second main top oil cylinder (301) is provided in the second guide frame (302), a pre-tightening anchor plate (306) is provided on the side of the second upper clamping anchor (303) away from the second main top oil cylinder (301), a second base (304) connected to the reaction force support (4) is provided at the other end of the second main top oil cylinder (301), a second lower clamping anchor (305) is provided in the second base (304), and the second lower clamping anchor (305) is used for clamping and loosening the steel strand (1); Axial through holes are provided in the first master oil cylinder (201) and the second master oil cylinder (301), and the reserved holes include the axial through holes.

4. A steel strand force deviation test device according to claim 3, characterized in that: The first upper clamping anchor (203), the first lower clamping anchor (205), the second upper clamping anchor (303) and the second lower clamping anchor (305) all comprise a secondary oil cylinder (701) connected to the hydraulic pump station (63); a secondary oil cylinder piston (702) is provided in the secondary oil cylinder (701); a clamping anchor plate (703) is provided at the output end of the secondary oil cylinder piston (702); and a limiting plate (704) is provided on a side of the clamping anchor plate (703) away from the secondary oil cylinder (701); A plurality of clip holes (705) are provided in the clamping anchor plate (703), two clips (706) are provided in the clip holes (705), the two clips (706) are arranged opposite to each other and are used to clamp the steel strand (1), the clip holes (705) are conical, and a plurality of through holes (707) are provided in the limiting plate (704); An axial through hole is provided at the end of the auxiliary oil cylinder (701) and in the auxiliary oil cylinder piston (702), and the reserved hole comprises the axial through hole, a clip hole (705) and a through hole (707).

5. A steel strand force deviation test device according to claim 4, characterized in that: The pre-tightening anchor plate (306) comprises a plate body (361), the plate body (361) is connected to the limiting plate (704) via a second bolt (362) and a second nut (363), and the second bolt (362) passes through the plate body (361) and the limiting plate (704); A plurality of jacket holes (364) are provided in the disc body (361), and a jacket (365) is provided in the jacket hole (364); The jacket hole (364) is conical, the jacket (365) is matched with the jacket hole (364), the jacket (365) is an elastic jacket, and a plurality of openings are provided at one end of the jacket (365) with a larger diameter. The jacket (365) is used for the steel strand (1) to pass through and clamp the steel strand (1); The reserved holes include a jacket hole (364).

6. A steel strand force deviation test device according to claim 5, characterized in that: A plurality of support blocks (371) are provided on a side of the disk body (361) away from the limiting plate (704); a side of the support block (371) away from the limiting plate (704) is connected to a fixing plate (372) via a threaded rod (373) and a third nut (374); the threaded rod (373) is connected to the support block (371); the threaded rod (373) passes through the fixing plate (372); the third nut (374) is threadedly connected to the threaded rod (373); a plurality of mounting holes are provided in the fixing plate (372); an electromagnet (375) is provided in the mounting hole; a permanent magnet (377) is provided in the jacket (365); the permanent magnet (377) is close to the electromagnet (375); and the electromagnet (375) is electrically connected to the control unit (62); A plug sleeve (376) is provided on one side of the fixing plate (372) close to the limiting plate (704), and the plug sleeve (376) is used to open the portion of the jacket (365) provided with an opening. The steel strand (1) can pass through the plug sleeve (376) and the mounting hole, and the reserved hole includes the mounting hole.

7. The steel strand force deviation test device according to claim 1 is characterized by: The monitoring mechanism (5) comprises a tension sensor (501) and two threaded posts (502) connected to the tension sensor (501); the threaded posts (502) are connected to a connecting plate (503); the connecting plate (503) is connected to a mounting plate (504) via a connecting structure; a clamp (505) is provided inside the mounting plate (504); and the steel strand (1) passes through the clamp (505); The mounting plate (504) is provided with a tapered hole, and the outer peripheral surface of the chuck (505) is adapted to the tapered hole; The tension sensor (501) is connected to the control unit (62) via the sensor acquisition module (61); The connection structure includes: A first bolt (511) and a first nut (512), wherein the first bolt (511) passes through the connecting plate (503) and the mounting plate (504), and the first nut (512) is threadedly connected to the first bolt (511); or The mounting plate (504) is hingedly connected to a plurality of connecting rods (521) via a hinge shaft (522); the connecting rods (521) are connected to connecting blocks (523); the connecting plate (503) is connected to a fixing block (524); a limiting block (525) is provided on a side of the fixing block (524); a limiting groove matching the limiting block (525) is provided in the connecting plate (503); the limiting block (525) is located in the limiting groove; and a tension spring (526) is provided between the plurality of connecting rods (521).

8. A method for using the steel strand force deviation test device according to any one of claims 1 to 7, characterized in that: The steps include: S1, connecting two sections of steel strands (1) through a monitoring mechanism (5), the tension sensor (501) in the monitoring mechanism (5) is connected to a sensor acquisition module (61) through a cable, and a pre-tightening anchor plate (306) is provided in one of the continuous jacks; S2, cutting the steel strand (1) into two sections, the two sections of the steel strand (1) respectively passing through the reserved holes in two consecutive jacks, and finally merging in the reaction support (4), the two sections of the same steel strand (1) corresponding to each other; S3, connecting the two steel strands (1) via a monitoring mechanism (5), and connecting the tension sensor (501) in the monitoring mechanism (5) to the sensor acquisition module (61) via a cable; S4, the steel strand (1) is connected to the first upper clamping anchor (203), the first lower clamping anchor (205) and the second lower clamping anchor (305), and is clamped to apply a pre-tightening force; S5, the second main top oil cylinder (301) works to apply different pre-tightening forces to each steel strand (1); S6. After the pre-tightening operation of each steel strand, the second main top oil cylinder (301) is retracted, so that the force of the steel strand (1) is transferred to the second lower clamping anchor (305); S7, the first main oil cylinder (201) works, the tension sensor (501) detects the tension signal, the sensor acquisition module (61) receives the tension signal and transmits it to the control unit (62), and the control unit (62) records the force change of each steel strand; S8. When the stroke of the first main top oil cylinder (201) reaches the maximum value or the force on one of the steel strands reaches 100 kN, the action stops, and the influence of different initial preload forces of the steel strands on the overall tensioning force deviation is analyzed.

9. The method for using the steel strand force deviation test device according to claim 8, characterized in that: Also included in S5: S51, connecting one of the steel strands (1) to the pre-tightening anchor plate (306); S52, the second main top oil cylinder (301) operates to drive the pre-tightening anchor plate (306) to move a certain distance and then stop, and then connect the second steel strand (1) to the pre-tightening anchor plate (306); S53, the second main top oil cylinder (301) continues to work, driving the pre-tightening anchor plate (306) to move a certain distance and then stop, and then connects the third steel strand (1) to the pre-tightening anchor plate (306); S54, repeating steps S52-S53 until all the used steel strands (1) are connected to the pre-tightening anchor plate (306); The second main top oil cylinder (301) monitors the pre-tightening force exerted on different steel strands (1) in real time when it is working. The pre-tightening force exerted on the steel strands (1) is detected by a tension sensor (501) and the signal is transmitted to the control unit (62). The difference in the pre-tightening force exerted on different steel strands (1) is 0.1-10 kN.

10. The method for using the steel strand force deviation test device according to claim 9, characterized in that In S5, the steps for connecting the steel strand (1) and the pre-tightening anchor plate (306) are as follows: S501, start the electromagnet (375) to attract the permanent magnet (377), thereby driving the jacket (365) to approach the fixed plate (372); S502, when connecting the steel strand (1), marking the tension sensor (501) and the electromagnet (375) connected to the same steel strand (1) through the control unit (62); S503, presetting the preload force required for each steel strand (1); S504, when the tension sensor (501) corresponding to one of the steel strands (1) detects that the tension reaches the pre-tightening force, the corresponding electromagnet (375) is activated to reverse its magnetic field; S505, the electromagnet (375) pushes the permanent magnet (377) to return the jacket (365) to the jacket hole (364), and the opening of the jacket (365) is tightened under the action of the jacket hole (364), thereby clamping the steel strand (1).

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