A kind of concrete prestressed steel bar tensioning equipment and method

Abstract

The present invention discloses a concrete prestressed steel bar tensioning device and method, belonging to the technical field of concrete engineering, comprising anchor pads symmetrically distributed on both sides of a concrete column, an anchor plate fixed at the middle of the anchor pad, a plurality of anchor holes distributed on the anchor plate, clips arranged in the anchor holes, each steel bar correspondingly inserted in the clips; a tensioning unit is arranged cocentrically outside the anchor pad, a fixing plate is fixed on one side of the tensioning unit; a fine-tuning anchor plate is installed at the tensioning telescopic end of the tensioning unit, the fine-tuning anchor plate is used to clamp and fix the end of the steel bar, and pre-tensioning and fine-tuning each steel bar before tensioning, so that each steel bar in the tensioning unit maintains a uniform tensioning stress before the tensioning process is carried out; the present invention can avoid plastic deformation and stress concentration of the steel bar caused by continuous loading during the tensioning process, protect the steel bar from excessive damage, and extend its service life.

Description

Technical Field

[0001] The invention belongs to the technical field of concrete engineering, and in particular relates to a concrete prestressed steel bar tensioning device and method. Background Art

[0002] Prestressed concrete steel bar tensioning is an important technical means to improve the performance of concrete structures. That is, by applying stress (i.e. prestress) to the concrete in advance, the tensile stress generated by the structure under the use load is partially or completely offset, thereby improving the stress-bearing performance of the structure. Traditional technology often uses jack-type tensioning machines for overall prestressing. Under high-tension working conditions, steel bars are prone to concentrated stress at certain weak points, increasing the risk of fracture. When multiple steel bars are tensioned simultaneously, the initial tensioning conditions of each steel bar are different, resulting in differences in the internal prestress of each steel bar after tensioning, affecting the overall durability of the concrete structure and even causing cracks or damage.

[0003] Therefore, it is necessary to provide a concrete prestressed steel bar tensioning device and method to solve the problems raised in the above background technology. Summary of the invention

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a concrete prestressed steel bar tensioning equipment, which includes anchor pads, which are symmetrically distributed on both sides of the concrete column, an anchor plate is fixed in the middle of the anchor pad, a plurality of anchor holes are distributed on the anchor plate, and a clamp is arranged in each anchor hole, and each steel bar is correspondingly inserted in the clamp, and the clamp is used to anchor each tensioned steel bar; a tensioning unit is arranged cocentrically outside the anchor pad, a fixed disk is fixed on one side of the tensioning unit, and a plurality of column rods are distributed circumferentially on the fixed disk, and the other end of each column rod is fixed to the anchor pad; a fine-tuning anchor disk is installed at the tensioning telescopic end of the tensioning unit, and the fine-tuning anchor disk is used to clamp and fix the end of the steel bar, and pre-tension fine-tune each steel bar before tensioning, so that each steel bar in the tensioning unit maintains a uniform tensioning stress before the tensioning process is carried out;

[0005] The tensioning unit comprises a cylinder body, an annular liquid tank is provided inside the cylinder body, a piston is sealingly and slidably connected in the annular liquid tank, a base is sealingly connected to one side of the cylinder body, and a liquid inlet oil path and a liquid discharge oil path are provided in the base; a positioning ring is fixed on the piston, a shaft tube is coaxially and rotatably connected in the positioning ring, and the end of the shaft tube is rotatably connected to the piston;

[0006] An axial setback mechanism is slidably connected in the cylinder body, one end of the shaft tube away from the base is connected to the axial setback mechanism, and the fine-tuning anchor plate is installed at the other end of the axial setback mechanism; the axial setback mechanism cooperates with the piston sliding to perform tensioning stress test according to the specifications of the steel bars and the initial distribution conditions, so as to provide data reference for the fine-tuning of the steel bars in the pre-tensioning stage; then the axial setback mechanism provides a slight setback stepping action to the steel bars in the tensioning state and gradually applies force in the tensioning stage.

[0007] Preferably, the axial setback mechanism comprises a sleeve, which is slidably arranged in the cylinder body, an end cover is fixed on the cylinder body, the sleeve is slidably connected to the end cover, an outer shaft plate is fixed to one end of the sleeve; an shaft pressure plate is fixed on the shaft tube, and the shaft pressure plate is in abutment with the outer shaft plate; and an inner ring sleeve is concentrically arranged in the annular liquid bin of the cylinder body, pins are symmetrically fixed on the side wall of the shaft pressure plate, a guide groove is opened on the inner wall of the inner ring sleeve, and one end of the pin slides along the guide groove;

[0008] The contact surface between the shaft pressure plate and the outer shaft plate is set to a sawtooth structure, so that when the cross section of the guide groove is non-linear, the shaft pressure plate generates positive or reverse rotation through the sliding action of the pin and the guide groove during the sliding of the piston.

[0009] Preferably, the guide groove is divided into multiple sections, which are a test section, a tensioning control section and a finishing section in sequence; wherein the cross-section of the test section is a wavy structure, and a plurality of pressure sensors are distributed circumferentially between the shaft pressure plate and the outer shaft plate.

[0010] Preferably, the fine-tuning anchor plate is provided with a plurality of slidably connected limit sleeves distributed circumferentially, the inner wall of each limit sleeve is a trapezoidal structure, and a steel bar clamp is provided inside the limit sleeve; the fine-tuning anchor plate is provided with a plurality of adjustment rings corresponding to the limit sleeves, one end of the adjustment ring is rotatably sleeved outside the limit sleeve; the side wall of the adjustment ring is provided with a threaded groove, and is slidably connected with the fine-tuning anchor plate through threaded meshing;

[0011] A pressure sensor is distributed between the steel bar clamp and the limiting sleeve.

[0012] Preferably, each of the adjustment rings is slid and fine-tuned along the axis direction of the fine-tuning anchor plate according to the tensioning stress test condition of the steel bar in the pre-tensioning stage.

[0013] Preferably, the inner ring sleeve can be relatively rotatably arranged inside the cylinder body, a gear ring is coaxially fixed on the inner ring sleeve, and a control motor is installed outside the cylinder body, and the output end of the control motor is connected to the gear ring for transmission through gear meshing; a plurality of guide grooves of different specifications are opened on the side wall of the inner ring sleeve.

[0014] Preferably, the tensioning control sections of the guide grooves of different specifications are configured as oblique line structures with different slopes or wavy line structures with different curvatures.

[0015] Preferably, the end section of the guide groove is configured as a straight line structure.

[0016] Preferably, a method for tensioning prestressed concrete steel bars comprises the following steps:

[0017] S1. Work preparation: after the concrete column is cast and formed, steel bars are arranged in the concrete column, wherein multiple steel bars are inserted into the corrugated pipe pre-buried in the concrete column, spiral bars are arranged at the end of the corrugated pipe, and the anchor plate is assembled against one side of the spiral bars. At this time, multiple steel bars are sequentially inserted into the clips in the anchor plate; and then the cylinder body is installed;

[0018] S2. Tension test: hydraulic oil is pumped gradually through the inlet oil line on the cylinder body, the piston slides along the cylinder body and gradually tightens the steel bar. When the shaft pressure plate on the shaft tube moves to the inner ring sleeve, the pin and the guide groove slide to limit the position; as the piston continues to move, the pin slides along the test section of the guide groove, the shaft pressure plate is slightly twisted, and the tension stress is detected by the pressure sensor;

[0019] S3. Tension fine-tuning: manually adjust each adjustment ring according to the tensile stress test results of each steel bar so that the tensile stress of the steel bars is uniform;

[0020] S4. During the tensioning construction, concrete slurry is injected into the corrugated pipe, and hydraulic oil is continuously pumped through the inlet oil circuit on the cylinder body. The pin on the axial pressure plate slides along the tensioning control section of the guide groove, so that the fine-tuning anchor plate provides a setback tensioning effect on the steel bar during axial sliding, promoting full bonding between the steel bar and the concrete;

[0021] S5. Tensioning end: When the concrete solidification degree reaches 90%, it enters the tensioning end stage. At this time, the pin on the axial pressure plate slides along the end section of the guide groove and remains for a period of time after the end;

[0022] Finally, anchoring is performed by locking the anchor.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] The steel bar tensioning equipment used in the present invention is based on the general jack for structural expansion. By setting an axial setback mechanism, different strengths of axial setback effects are provided during the steel bar tensioning process. On the one hand, it can cooperate with the pressure sensor to detect and obtain the initial tensioning stress of each steel bar in the pre-tensioning stage, so as to fine-tune the anchor plate to pre-tighten and fine-tune the steel bar to keep each steel bar at a uniform tensioning stress; on the other hand, it can avoid the plastic deformation and stress concentration of the steel bar caused by continuous loading during the tensioning process, protect the steel bar from excessive damage, and extend its service life; at the same time, it can also ensure that the prestress is more evenly distributed in the concrete, reduce excessive stress concentration in local areas, and improve the overall uniformity and stability of the structure; and make the steel bar and concrete fully bonded, promote the self-healing of micro cracks, enhance the mechanical bite between the steel bar and concrete, and improve the integrity of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0026] Figure 2 is a cross-sectional view of the present invention;

[0027] Figure 3 It is a structural schematic diagram of the axial setback mechanism in the present invention;

[0028] Figure 4 A half-section view of the guide groove of the present invention;

[0029] Figure 5 It is a structural schematic diagram of the fine-tuning anchor plate in the present invention;

[0030] Figure 6 It is a schematic diagram of the structure of the gear ring and the control motor in the present invention;

[0031] In the figure: 1. anchor plate; 11. anchor plate; 12. fixing plate; 13. column rod; 2. tensioning unit; 21. cylinder block; 22. piston; 23. base; 24. oil inlet; 25. positioning ring; 26. shaft tube; 27. end cover; 3. fine-tuning anchor plate; 31. limiting sleeve; 32. steel bar clamp; 33. adjusting sleeve ring; 4. axial setback mechanism; 41. pipe sleeve; 42. outer shaft plate; 43. shaft pressure plate; 44. inner ring sleeve; 45. pin; 46. guide groove; 47. pressure sensor; 48. gear ring; 49. control motor. DETAILED DESCRIPTION

[0032] See also Figure 1-Figure 6In an embodiment of the present invention, a prestressed concrete steel bar tensioning device includes an anchor plate 1, which is symmetrically distributed on both sides of a concrete column. An anchor plate 11 is fixed to the middle of the anchor plate 1. A plurality of anchor holes are distributed on the anchor plate 11. Clips are arranged in the anchor holes. Each steel bar is correspondingly inserted into the clip. The clip is used to anchor each tensioned steel bar; a tensioning unit 2 is arranged cocentrically outside the anchor plate 1. A fixed disk 12 is fixed to one side of the tensioning unit 2. The fixed disk 12 is divided into A plurality of columns 13 are arranged, and the other end of each column 13 is fixed to the anchor plate 1; a fine-tuning anchor plate 3 is installed at the tensioning telescopic end of the tensioning unit 2, and the fine-tuning anchor plate 3 is used to clamp and fix the end of the steel bar, and to pre-tighten and fine-tune each steel bar before tensioning, so that each steel bar in the tensioning unit maintains a uniform tensioning stress before the tensioning process; the internal stress difference of the structure caused by the inconsistent tensioning of individual steel bars is reduced, and the stability and durability of the entire prestressed concrete structure are enhanced;

[0033] The tensioning unit 2 comprises a cylinder 21, an annular liquid tank is provided inside the cylinder 21, a piston 22 is sealingly and slidably connected in the annular liquid tank, a base 23 is sealingly connected to one side of the cylinder 21, a liquid inlet oil path 24 and a liquid discharge oil path are provided in the base 23; a positioning ring 25 is fixed to the piston 22, a shaft tube 26 is coaxially and rotatably connected in the positioning ring 25, and the end of the shaft tube 26 is rotatably connected to the piston 22;

[0034] An axial setback mechanism 4 is slidably connected in the cylinder body 21, one end of the shaft tube 26 away from the base 23 is connected to the axial setback mechanism 4, and the fine-tuning anchor plate 3 is installed at the other end of the axial setback mechanism 4; the axial setback mechanism 4 cooperates with the piston 22 to slide and perform tension stress test according to the steel bar specifications and initial distribution conditions, thereby providing data reference for fine-tuning of the steel bars in the pre-tensioning stage, ensuring that each steel bar can reach the expected initial stress state during formal tensioning; then the axial setback mechanism 4 provides a slight setback stepping action to the steel bars in the tensioning state during the tensioning stage and The force is applied gradually, and the setback effect during the steel bar tensioning process can reduce the plastic deformation and stress concentration of the steel bars caused by continuous loading to a certain extent, protect the steel bars from excessive damage, and at the same time allow the prestress to be more evenly distributed in the concrete, reduce excessive stress concentration in local areas, and further promote the self-healing of micro cracks, enhance the mechanical bite between steel bars and concrete, and at the same time, by controlling the tensioning rate and the frequency and time of setbacks, the development of micro cracks in the concrete can be better controlled during the prestressing process to reduce the risk of cracking, which is especially suitable for brittle or crack-prone concrete materials.

[0035] In this embodiment, the axial frustration mechanism 4 includes a sleeve 41, which is slidably arranged in the cylinder body 21, and an end cover 27 is fixed on the cylinder body 21. The sleeve 41 is slidably connected to the end cover 27, and an outer shaft plate 42 is fixed to one end of the sleeve 41; an axial pressure plate 43 is fixed to the shaft tube 26, and the axial pressure plate 43 is in abutment with the outer shaft plate 42; and an inner ring sleeve 44 is concentrically arranged in the annular liquid bin of the cylinder body 21, and pins 45 are symmetrically fixed on the side wall of the axial pressure plate 43, and a guide groove 46 is opened on the inner wall of the inner ring sleeve 44, and one end of the pin 45 slides along the guide groove 46;

[0036] The contact surface between the axial pressure plate 43 and the outer axial plate 42 is set to a serrated structure, so that when the cross-section of the guide groove 46 is non-linear, the axial pressure plate 43 produces positive or reverse rotation through the sliding action of the pin 45 and the guide groove 46 as the piston 22 slides, thereby providing an axial tensioning effect on the steel bars when the serrated surface of the axial pressure plate 43 and the outer axial plate 42 is in contact, thereby avoiding local stress concentration on the steel bars.

[0037] As a preferred embodiment, the guide groove 46 is divided into multiple sections, which are respectively a test section, a tensioning control section and a finishing section; the cross-section of the test section is a wavy structure, and a plurality of pressure sensors 47 are distributed circumferentially between the axial pressure plate 43 and the outer axial plate 42, so that the tensioning stress of each steel bar can be fully detected by fine-tuning each pressure sensor 47 in the anchor plate in coordination with the slight setbacks of the steel bar in the tensioning stress test.

[0038] In this embodiment, the fine-tuning anchor plate 3 is circumferentially distributed with a plurality of slidably connected limit sleeves 31, the inner wall of each limit sleeve 31 is a trapezoidal structure, and a steel bar clamp 32 is arranged inside the limit sleeve 31; the fine-tuning anchor plate 3 is provided with a plurality of adjustment rings 33 corresponding to the limit sleeves 31, and one end of the adjustment ring 33 is rotatably sleeved outside the limit sleeve 31; the side wall of the adjustment ring 33 is provided with a threaded groove, and is slidably connected with the fine-tuning anchor plate 3 through threaded meshing;

[0039] A pressure sensor 47 is distributed between the steel bar clamp 32 and the limiting sleeve 31 .

[0040] In this embodiment, each of the adjusting rings 33 is slid and fine-tuned along the axial direction of the fine-tuning anchor plate 3 according to the tension stress test condition of the steel bar in the pre-tensioning stage.

[0041] In this embodiment, the inner ring sleeve 44 can be relatively rotatably arranged in the cylinder body 21, a gear ring 48 is coaxially fixed on the inner ring sleeve 44, and a control motor 49 is installed outside the cylinder body 21, and the output end of the control motor 49 is connected to the gear ring 48 for transmission through gear meshing; a plurality of guide grooves 46 of different specifications are opened on the side wall of the inner ring sleeve 44.

[0042] As a preferred embodiment, the tensioning control sections of the guide grooves 46 of different specifications are set to oblique line structures with different slopes or wavy line structures with different curvatures. Therefore, in the steel bar tensioning stage, the guide grooves with oblique line structures with different slopes (or wavy line structures with different curvatures) can provide axial setback tensioning of different frequencies and intensities through the contact between the axial pressure plate and the serrated surface of the outer shaft plate 42, thereby providing suitable tensioning effects for steel bars of different specifications and avoiding stress concentration.

[0043] In this embodiment, the end section of the guide groove 46 is configured as a straight line structure.

[0044] In this embodiment, a method for tensioning prestressed concrete steel bars comprises the following steps:

[0045] S1. Work preparation. After the concrete column is cast and formed, steel bars are arranged in the concrete column. Multiple steel bars are inserted into the corrugated tube embedded in the concrete column. Spiral bars are arranged at the end of the corrugated tube. The anchor plate 1 is assembled against one side of the spiral bars. At this time, multiple steel bars are inserted into the clips in the anchor plate 1 in sequence; then the cylinder body 21 is installed; it is necessary to check whether all the steel bars pass through the corrugated tube smoothly and are correctly placed in the clips of the anchor plate without crossing or twisting, and then the clips are closed and locked to prepare for tensioning.

[0046] S2. Tension test: hydraulic oil is pumped gradually through the inlet oil passage 24 on the cylinder body 21, the piston 22 slides along the cylinder body 21 and gradually tightens the steel bar. When the shaft pressure plate 43 on the shaft tube 26 moves to the inner ring sleeve 44, the pin 45 and the guide groove 46 slide and limit. As the piston 22 continues to move, the pin 45 slides along the test section of the guide groove 46, the shaft pressure plate 43 is slightly twisted, and the tension stress is detected by the pressure sensor 47.

[0047] S3. Tension fine-tuning, manually adjusting each adjustment ring 33 according to the tensile stress test of each steel bar, so that the tensile stress of the steel bars is unified; after the adjustment, the tensile stress test can be performed again on each steel bar to verify whether a uniform preset stress value has been reached, until the tensile stress of all steel bars meets the design standard;

[0048] S4. During the tensioning construction, concrete slurry is injected into the corrugated pipe, and hydraulic oil is continuously pumped through the inlet oil passage 24 on the cylinder body 21. The pin 45 on the axial pressure plate 43 slides along the tensioning control section of the guide groove 46, so that the fine-tuning anchor plate 3 provides a setback tensioning effect on the steel bar during axial sliding, thereby promoting sufficient bonding between the steel bar and the concrete;

[0049] S5. Tensioning end, when the concrete solidification degree reaches 90%, it enters the tensioning end stage, at which time the pin 45 on the axial pressure plate 43 slides along the end section of the guide groove 46 to apply the tensioning prestress uniformly and stably to ensure the stability and safety of the structure, and maintain it for a period of time after the end;

[0050] Finally, anchoring is performed by locking the anchor.

[0051] What is described above is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A concrete prestressed steel bar tensioning device, characterized in that: It comprises anchor pads (1) symmetrically distributed on both sides of the concrete column; A tensioning unit (2) is provided cocentrically outside the anchor plate (1), a fixing plate (12) is fixed to one side of the tensioning unit (2), a plurality of column rods (13) are distributed circumferentially on the fixing plate (12), and the other end of each column rod (13) is fixed to the anchor plate (1); A fine-tuning anchor plate (3) is installed at the tensioning telescopic end of the tensioning unit (2); The tensioning unit (2) comprises a cylinder body (21) having an annular liquid tank inside, a piston (22) being sealingly and slidably connected in the annular liquid tank, a base (23) being sealingly connected to one side of the cylinder body (21), a liquid inlet oil path (24) and a liquid discharge oil path being provided in the base (23); a positioning ring (25) being fixed to the piston (22), a shaft tube (26) being coaxially and rotatably connected in the positioning ring (25), and an end of the shaft tube (26) being rotatably connected to the piston (22); An axial setback mechanism (4) is slidably connected in the cylinder body (21), one end of the shaft tube (26) away from the base (23) is connected to the axial setback mechanism (4), and the fine-tuning anchor plate (3) is installed at the other end of the axial setback mechanism (4); The axial setback mechanism (4) comprises a sleeve (41) slidably disposed in the cylinder body (21); an end cover (27) is fixed to the cylinder body (21); the sleeve (41) is slidably connected to the end cover (27); an outer shaft plate (42) is fixed to one end of the sleeve (41); A shaft pressure plate (43) is fixed on the shaft tube (26), and the shaft pressure plate (43) is in abutment contact with the outer shaft plate (42); An inner ring sleeve (44) is co-centeredly arranged in the annular liquid bin of the cylinder body (21), a pin (45) is symmetrically fixed on the side wall of the shaft pressure plate (43), a guide groove (46) is formed on the inner wall of the inner ring sleeve (44), and one end of the pin (45) slides along the guide groove (46).

2. The concrete prestressed steel bar tensioning equipment according to claim 1, characterized in that: An anchor plate (11) is fixed to the middle of the anchor pad (1), and a plurality of anchor holes are distributed on the anchor plate (11). Clips are arranged in each of the anchor holes, and each steel bar is correspondingly inserted into the clip, and the clips are used to anchor each tensioned steel bar; The fine-tuning anchor plate (3) is used to clamp and fix the end of the steel bar, and to pre-tighten and fine-tune each steel bar before tensioning, so that each steel bar in the tensioning unit (2) maintains a uniform tensioning stress before the tensioning process is carried out; The axial setback mechanism (4) cooperates with the piston (22) to slide and perform tension stress testing according to the steel bar specifications and initial distribution conditions, thereby providing data reference for fine-tuning the steel bars in the pre-tensioning stage; Then, the axial setback mechanism (4) provides a slight setback stepping action to the steel bar in the tensioning state and gradually applies force during the tensioning stage; The contact surface between the shaft pressure plate (43) and the outer shaft plate (42) is configured as a sawtooth structure, so that when the cross section of the guide groove (46) is non-linear, the shaft pressure plate (43) generates positive or reverse rotation as the piston (22) slides through the sliding action of the pin (45) and the guide groove (46).

3. The concrete prestressed steel bar tensioning equipment according to claim 2, characterized in that: The guide groove (46) is divided into multiple sections, which are a test section, a tension control section, and a finishing section in sequence; The cross section of the test section has a wavy structure.

4. The concrete prestressed steel bar tensioning equipment according to claim 2, characterized in that: A plurality of slidably connected limiting sleeves (31) are distributed around the circumference of the fine-tuning anchor plate (3), the inner wall of each limiting sleeve (31) is a trapezoidal structure, and a steel bar clamp (32) is arranged inside each limiting sleeve (31); The fine-tuning anchor plate (3) is provided with a plurality of adjustment collars (33) corresponding to the limiting sleeve (31), and one end of the adjustment collar (33) is rotatably sleeved outside the limiting sleeve (31); a thread groove is provided on the side wall of the adjustment collar (33), and is slidably connected to the fine-tuning anchor plate (3) through thread engagement; a pressure sensor (47) is distributed between the steel bar clamp (32) and the limiting sleeve (31).

5. The concrete prestressed steel bar tensioning equipment according to claim 4, characterized in that: Each of the adjustment rings (33) is slid and fine-tuned along the axis direction of the fine-tuning anchor plate (3) according to the tension stress test condition of the steel bar in the pre-tensioning stage.

6. The concrete prestressed steel bar tensioning equipment according to claim 3, characterized in that: The inner ring sleeve (44) is relatively rotatably arranged in the cylinder body (21), a gear ring (48) is coaxially fixed on the inner ring sleeve (44), and a control motor (49) is installed outside the cylinder body (21), and an output end of the control motor (49) is connected to the gear ring (48) for transmission through gear meshing; A plurality of guide grooves (46) of different specifications are formed on the side wall of the inner ring sleeve (44).

7. The concrete prestressed steel bar tensioning equipment according to claim 6, characterized in that: The tension control sections of the guide grooves (46) of different specifications are arranged as oblique line structures with different slopes or wavy line structures with different curvatures.

8. The concrete prestressed steel bar tensioning equipment according to claim 3, characterized in that: The tail section of the guide groove (46) is configured as a straight line structure.

9. A method for tensioning prestressed concrete steel bars, using the prestressed concrete steel bar tensioning device according to claim 4, characterized in that: It includes the following steps: S1. Work preparation: after the concrete column is cast and formed, steel bars are arranged in the concrete column, wherein a plurality of steel bars are inserted into a corrugated tube pre-buried in the concrete column, a spiral bar is arranged at the end of the corrugated tube, and an anchor plate (1) is assembled against one side of the spiral bar. At this time, a plurality of steel bars are sequentially inserted into the clips in the anchor plate (1); and then the cylinder body (21) is installed; S2. Tension test: hydraulic oil is pumped gradually through the inlet oil passage (24) on the cylinder body (21), the piston (22) slides along the cylinder body (21) and gradually tightens the steel bar. When the shaft pressure plate (43) on the shaft tube (26) moves to the inner ring sleeve (44), the pin (45) and the guide groove (46) slide to limit the position. As the piston (22) continues to move, the pin (45) slides along the test section of the guide groove (46), the shaft pressure plate (43) is slightly twisted, and the tension stress is detected by the pressure sensor (47); S3 tensioning fine-tuning, according to the tension stress test of each steel bar manually adjust the adjustment ring (33), so that the steel bar tension stress uniform; S4. During the tensioning construction, concrete slurry is injected into the corrugated pipe, and hydraulic oil is continuously pumped through the inlet oil passage (24) on the cylinder body (21). The pin (45) on the axial pressure plate (43) slides along the tensioning control section of the guide groove (46), so that the fine-tuning anchor plate (3) provides a setback tensioning effect on the steel bar during axial sliding, thereby promoting full bonding between the steel bar and the concrete. S5. The tensioning is finished. When the concrete solidification degree reaches 90%, the tensioning is finished. At this time, the pin (45) on the axial pressure plate (43) slides along the finishing section of the guide groove (46) and is maintained for a period of time after the end. Finally, anchoring is performed by locking the anchor.

Images