Cast-in-place pile steel bar straightening device

Abstract

The invention relates to the technical field of building construction, in particular to a reinforcing steel bar straightening device for a cast-in-place pile. Comprising a bottom plate, a rack, sliding blocks, telescopic rods and straightening assemblies, the upper wall of the bottom plate is fixedly connected with the rack, the side walls of the rack are slidably connected with the sliding blocks, the side walls of the sliding blocks are fixedly connected with the telescopic rods, and the ends, away from the sliding blocks, of the telescopic rods are fixedly connected with the straightening assemblies; the straightening assembly comprises a straightening plate, a first straightening column, a second straightening column and a third straightening column. The first straightening column, the second straightening column and the third straightening column are slidably connected to the straightening plate through a first electric push rod, a second electric push rod and a third electric push rod correspondingly. Pressure sensors are arranged on the opposite side walls of the first straightening column, the second straightening column and the third straightening column. The controller controls the first electric push rod, the second electric push rod and the third electric push rod to move, and when the readings of all the pressure sensors are changed, the movement is stopped; the steel bar straightening device is conveniently suitable for straightening steel bars with different diameters, and the straightening effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly to a device for straightening the steel bars of cast-in-place piles. Background Art

[0002] A cast-in-place pile is a pile formed by drilling a hole in place and pouring concrete or reinforced concrete; reinforced concrete cast-in-place piles are commonly seen in building construction and pile foundation projects. According to relevant standard specifications, to ensure the construction quality of cast-in-place piles, the pile top needs to be over-poured by not less than 0.5 m; therefore, before the construction of the upper structure in the later stage, it is necessary to chisel off the concrete at the pile head part. Currently, most on-site constructions use impact drills for chiseling, resulting in serious bending and deformation of the steel bars below the pile head. After the pile head is chiseled off, it is necessary to straighten the steel bars below the pile head.

[0003] The prior art CN114160711B discloses a device for straightening the steel bars of a cast-in-place pile head and its usage method. The straightening device includes: a plurality of arc-shaped structures are sequentially spliced into a circular structure; a directional pulley is slidably arranged on the inner side of each arc-shaped structure, and the steel bars for straightening are arranged between the plurality of directional pulleys, and the steel bars can be tangent to each directional pulley; a lifting ring is arranged on each arc-shaped structure for connecting a steel wire rope for hoisting. By splicing a plurality of arc-shaped structures into a circular structure, each directional pulley on the inner side abuts against the steel bars to be straightened. By applying a traction force on each arc-shaped structure, the bent part of the steel bars deforms, realizing the straightening of the steel bars; before straightening, it is necessary to obtain the diameter size of the straightening steel bars, then match a plurality of arc-shaped structures of corresponding sizes, perform pre-assembly, and then straighten. When the above straightening device straightens steel bars of different diameters, it is also necessary to match arc-shaped structures of corresponding sizes, which is not convenient for straightening steel bars of different diameters, and the straightening effect is also poor.

[0004] Therefore, there is an urgent need to provide a device for straightening the steel bars of cast-in-place piles, which is convenient for straightening steel bars of different diameters and improves the straightening effect compared with the prior art. Summary of the Invention

[0005] The present invention solves the technical problems existing in the prior art, and provides a device for straightening the steel bars of cast-in-place piles.

[0006] To achieve the above object, the technical scheme adopted by the present invention is as follows:

[0007] A steel bar straightening device for cast-in-place piles, comprising a bottom plate, a frame, a slider, a telescopic rod and a straightening assembly. The upper wall of the bottom plate is fixedly connected to the frame. The side wall of the frame is slidably connected to the slider. The side wall of the slider is fixedly connected to the telescopic rod. The end of the telescopic rod away from the slider is fixedly connected to the straightening assembly. The straightening assembly includes a straightening plate, a first straightening column, a second straightening column and a third straightening column. The axes of the first straightening column, the second straightening column and the third straightening column are all perpendicular to the straightening plate. The first straightening column is slidably connected to the straightening plate through a first electric push rod. The second straightening column is slidably connected to the straightening plate through a second electric push rod. The third straightening column is slidably connected to the straightening plate through a third electric push rod.

[0008] Pressure sensors are provided on the opposite side walls of the first straightening column, the second straightening column and the third straightening column. All the pressure sensors, the first electric push rod, the second electric push rod and the third electric push rod are electrically connected to the controller. When the straightening assembly clamps the steel bar to be straightened for size matching, the controller controls the second electric push rod and the third electric push rod to move the second straightening column and the third straightening column to the same vertical line, and controls the movement of the first electric push rod. When the readings of all the pressure sensors change, the movement of the first electric push rod is stopped.

[0009] Further, a first pressure sensor is provided on the side wall of the first straightening column, and the reading of the first pressure sensor is the first pressure value. A second pressure sensor is provided on the side wall of the second straightening column, and the reading of the second pressure sensor is the second pressure value. A third pressure sensor is provided on the side wall of the third straightening column, and the reading of the third pressure sensor is the third pressure value. During the straightening process of the steel bar, the controller judges the first pressure value, the second pressure value and the third pressure value collected at each moment, so as to determine whether the first electric push rod, the second electric push rod and the third electric push rod need to move.

[0010] Even further, a first determination value P 1 、a second determination value P 2 and a third determination value P 3 are set, where P 1 <P 2 <P 3 ; The controller calculates a determination calculation value P based on the first pressure value, the second pressure value and the third pressure value, and compares the determination calculation value with the first determination value, the second determination value and the third determination value to determine whether the first electric push rod, the second electric push rod and the third electric push rod need to move. The specific judgment method is as follows:

[0011] For the first pressure value, the second pressure value and the third pressure value at each moment, they are sorted from small to large.

[0012] When 0 < P ≤ P1 When it is in this state, the controller controls that the first electric push rod, the second electric push rod and the third electric push rod do not move.

[0013] When P 1 < P ≤ P 2 When it is in this state, the controller only controls the electric push rod corresponding to the maximum pressure value to move a distance of L 1 .

[0014] When P 2 < P ≤ P 3 When it is in this state, the controller controls the electric push rod corresponding to the maximum pressure value to move a distance of L 3 , controls the electric push rod corresponding to the second pressure value to move a distance of L 2 , and controls the electric push rod corresponding to the third pressure value to move a distance of L 1 .

[0015] Among them, L 1 < L 2 < L 3 .

[0016] Furthermore, the determination calculation value at the i-th moment is specifically calculated by the following formula:

[0017]

[0018] In the above formula, P i represents the determination calculation value at the i-th moment, P 1i represents the first pressure value at the i-th moment, P 2i represents the second pressure value at the i-th moment, P 3i represents the third pressure value at the i-th moment, α 1 represents the correction value of the first pressure sensor, α 2 represents the correction value of the second pressure sensor, α 3 represents the correction value of the third pressure sensor.

[0019] Furthermore, L 1 , L 2 , L 3 are calculated according to the following formula:

[0020]

[0021] L 3 = (α 1 + α 3 ) × L × P i ;

[0022] In the above formula, L represents the maximum movement distance of the first electric push rod, the second electric push rod and the third electric push rod.

[0023] Furthermore, the telescopic rod includes a first connecting rod and a second connecting rod. The second connecting rod is slidably connected inside the first connecting rod. A cylinder is connected to the inner bottom of the first connecting rod. The output end of the cylinder is connected to the second connecting rod. The end of the second connecting rod extending out of the first connecting rod is connected to the straightening assembly. During the straightening process, the controller moves the cylinder to make the steel bar to be straightened inclined.

[0024] Furthermore, a slide rail is provided on the side wall of the frame. The slider is slidably connected inside the slide rail. A screw rod is rotatably connected inside the slide rail. The screw rod passes through the slider. A motor is fixedly connected to the upper end of the frame. The output end of the motor is fixedly connected to the screw rod. The motor drives the screw rod to make the slider move up and down inside the slide rail.

[0025] Furthermore, the controller controls the movement of the cylinder during the straightening process. The speed of the cylinder is calculated according to the following formula:

[0026] v 气 =sinθ×v 电 ;

[0027] In the above formula, v 气 represents the speed of the cylinder, v 电 represents the rotational speed of the motor, and θ represents the set inclination angle of the steel bar to be straightened.

[0028] Furthermore, the controller controls the cylinder to perform a uniform retraction movement and controls the motor to perform a uniform movement.

[0029] Furthermore, the first determination value P 1 , the second determination value P 2 and the third determination value P 3 are calculated according to the following formula:

[0030]

[0031]

[0032] In the above formula, A represents the cross-sectional area of the steel bar to be straightened, S represents the stress of the steel bar to be straightened, F s represents the tensile strength of the steel bar to be straightened, and Y represents the safety factor.

[0033] Compared with the prior art, the beneficial effects of the present invention are:

[0034] (1) The present invention sets a first straightening column, a second straightening column, and a third straightening column, and pressure sensors are provided on the opposite side walls of the first straightening column, the second straightening column, and the third straightening column. During the straightening process, according to the pressure detection of the three pressure sensors, the extension amount of the corresponding electric push rod is automatically adjusted, so that the straightening effect is better and the straightening operation is more accurate.

[0035] (2) The present invention is also applicable to reinforcing bars that need to be straightened into an inclined shape. An expansion rod and a cylinder are provided, and the speed of the cylinder is adjusted by the rotation speed of the motor, so that the reinforcing bar to be straightened becomes a uniform inclined state during the straightening process. Description of the Drawings

[0036] Figure 1 is the front view of the present invention.

[0037] Figure 2 is the left view of the present invention.

[0038] Figure 3 is the structural schematic diagram of the straightening assembly of the present invention.

[0039] Figure 4 is the partial schematic diagram showing the internal structure of the expansion rod of the present invention

[0040] Description of the Reference Numerals:

[0041] 1, base plate; 2, frame; 3, slide rail; 4, slider; 5, screw; 6, motor; 7, expansion rod; 71, first connecting rod; 72, second connecting rod; 73, bolt; 8, straightening assembly; 81, straightening plate; 82, first chute; 83, first moving block; 84, first electric push rod; 85, first straightening column; 86, second chute; 87, second moving block; 88, second electric push rod; 89, second straightening column; 810, third chute; 811, third moving block; 812, third electric push rod; 813, third straightening column; 9, reinforcing rod; 10, reinforcing frame; 11, pulley; 12, cylinder. Detailed Embodiments

[0042] The technical solutions of the present invention will be clearly described below in conjunction with the description of the drawings. Obviously, the described embodiments are not all the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention. It should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0043] As Figure 1 , Figure 2 shown, the present invention provides a bored pile steel bar straightening device, which includes a bottom plate 1, a frame 2, a slider 4, a telescopic rod 7 and a straightening assembly 8. The upper wall of the bottom plate 1 is fixedly connected to the frame 2. The side wall of the frame 2 is slidably connected to the slider 4. The side wall of the slider 4 is fixedly connected to the telescopic rod 7. The end of the telescopic rod 7 away from the slider 4 is fixedly connected to the straightening assembly 8. A reinforcing frame 10 is fixedly connected to the side wall of the frame 2. One end of the reinforcing frame 10 away from the frame 2 is fixedly connected to the bottom plate 1. The reinforcing frame 10, the frame 2 and the bottom plate 1 enclose a triangular space. A reinforcing rod 9 is fixedly connected to the slider 4. One end of the reinforcing rod 9 away from the slider 4 is fixedly connected to the telescopic rod 7. A triangular space is also enclosed among the reinforcing rod 9, the telescopic rod 7 and the slider 4. A slide rail 3 is provided on the side wall of the frame 2. The slide rail 3 extends along the length direction of the frame 2. The slider 4 is slidably connected inside the slide rail 3. A screw rod 5 is rotatably connected inside the slide rail 3. The screw rod 5 passes through the slider 4. The upper end of the frame 2 is fixedly connected to a motor 6. The output end of the motor 6 passes through the upper end of the frame 2 and is fixedly connected to the upper end of the screw rod 5. When the motor 6 rotates, it drives the screw rod 5 to rotate, so that the slider 4 moves up and down inside the slide rail 3. A plurality of pulleys 11 are provided on the lower wall of the bottom plate 1.

[0044] As Figure 3 shown, the straightening assembly 8 includes a straightening plate 81, a first straightening column 85, a second straightening column 89 and a third straightening column 813. First chutes 82, second chutes 86 and third chutes 810 are provided on the side wall of the straightening plate 81. A first moving block 83 is slidably connected inside the first chute 82. A second moving block 87 is slidably connected inside the second chute 86. A third moving block 811 is slidably connected inside the third chute 810. The side wall of the first moving block 83 is fixedly connected to the first straightening column 85. The side wall of the second moving block 87 is fixedly connected to the second straightening column 89. The side wall of the third moving block 811 is fixedly connected to the third straightening column 813. The axes of the first straightening column 85, the second straightening column 89 and the third straightening column 813 are all perpendicular to the side wall of the straightening plate 81. The first electric push rod 84, the second electric push rod 88 and the third electric push rod 812 are fixedly connected to the side of the straightening plate 81 perpendicular to the side wall provided with the first chute 82. The first electric push rod 84 corresponds to the first chute 82 and is used to push the first moving block 83 to move inside the first chute 82. The second electric push rod 88 corresponds to the second chute 86 and is used to push the second moving block 87 to move inside the second chute 86. The third electric push rod 812 corresponds to the third chute 810 and is used to push the third moving block 811 to move inside the third chute 810.

[0045] As Figure 4As shown in the figure, the telescopic rod 7 includes a first connecting rod 71, a second connecting rod 72, and a bolt 73. The second connecting rod 72 is slidably connected inside the first connecting rod 71. The side wall of the first connecting rod 71 is penetrated by the bolt 73. When it is necessary to relatively fix the first connecting rod 71 and the second connecting rod 72, the bolt 73 is tightened, and the first connecting rod 71 and the second connecting rod 72 can be fixedly connected; the end of the second connecting rod 72 extending out of the first connecting rod 71 is connected to the straightening assembly 8; the inner bottom of the first connecting rod 71 is fixedly connected to the cylinder 12, and the output end of the cylinder 12 is fixedly connected to the end of the second connecting rod 72, and the telescopic length of the telescopic rod 7 is adjusted by the cylinder 12.

[0046] Pressure sensors are provided on the opposite side walls of the first straightening column 85, the second straightening column 89, and the third straightening column 813. All the pressure sensors, the first electric push rod 84, the second electric push rod 88, the third electric push rod 812, and the cylinder 12 are electrically connected to the controller.

[0047] During the straightening process of the steel bar, some of the steel bars to be straightened need to have a certain inclination angle. The controller controls the movement of the cylinder 12 to realize the adjustment of the inclination angle of the steel bar to be straightened; the specific method is: set the set inclination angle of the steel bar to be straightened as θ; the controller controls the cylinder 12 to do a uniform retraction movement during the straightening process, and the controller controls the motor 6 to do a uniform movement. The speed of the cylinder 12 is calculated according to the following formula:

[0048] v 气 =sinθ×v 电 ;

[0049] In the above formula, v 气 represents the speed of the cylinder 12, and v 电 represents the rotation speed of the motor 6.

[0050] When the straightening assembly 8 clamps the steel bar to be straightened for size matching, the controller controls the second electric push rod 88 and the third electric push rod 812 to move the second straightening column 89 and the third straightening column 813 to the same vertical line, and controls the movement of the first electric push rod 84. When the readings of all the pressure sensors change, the movement of the first electric push rod 84 is stopped.

[0051] A first pressure sensor is provided on the side wall of the first straightening column 85, and the reading of the first pressure sensor is the first pressure value; a second pressure sensor is provided on the side wall of the second straightening column 89, and the reading of the second pressure sensor is the second pressure value; a third pressure sensor is provided on the side wall of the third straightening column 813, and the reading of the third pressure sensor is the third pressure value; during the straightening of the steel bar, the controller collects the real-time first pressure value, second pressure value, and third pressure value, and the controller judges each of the first pressure value, second pressure value, and third pressure value collected at each moment to determine whether the first electric push rod 84, the second electric push rod 88, and the third electric push rod 812 need to move.

[0052] Set a first determination value P 1 , a second determination value P 2 and a third determination value P 3 , where P 1 < P 2 < P 3 ; the controller calculates a determination calculation value P based on the first pressure value, the second pressure value, and the third pressure value, compares the determination calculation value with the first determination value, the second determination value, and the third determination value to determine whether the first electric push rod 84, the second electric push rod 88, and the third electric push rod 812 need to move. The specific judgment method is as follows:

[0053] For the first pressure value, the second pressure value, and the third pressure value at each moment, sort them from small to large;

[0054] When 0 < P ≤ P 1 , the controller controls the first electric push rod 84, the second electric push rod 88, and the third electric push rod 812 not to move;

[0055] When P 1 < ≤ P 2 , the controller only controls the electric push rod corresponding to the maximum pressure value to move a distance of L 1 ;

[0056] When P 2 < P ≤ P 3 , the controller controls the electric push rod corresponding to the maximum pressure value to move a distance of L 3 , controls the electric push rod corresponding to the second pressure value to move a distance of L 2 , and controls the electric push rod corresponding to the third pressure value to move a distance of L 1 ;

[0057] When P > P 3 , the controller controls the motor 6, the cylinder 12, the first electric push rod 84, the second electric push rod 88, and the third electric push rod 812 to stop moving.

[0058] Among them, L 1 < L2 <L 3 。

[0059] The determination calculation value at the i-th moment is specifically calculated by the following formula:

[0060]

[0061] In the above formula, P i represents the determination calculation value at the i-th moment, P 1i represents the first pressure value at the i-th moment, P 2i represents the second pressure value at the i-th moment, P 3i represents the third pressure value at the i-th moment, α 1 represents the correction value of the first pressure sensor, α 2 represents the correction value of the second pressure sensor, α 3 represents the correction value of the third pressure sensor.

[0062] L 1 、L 2 、L 3 are calculated according to the following formula:

[0063]

[0064] L 3 =(α 1 +α 3 )×L×P i ;

[0065] In the above formula, L represents the maximum movement distance of the first electric push rod 84, the second electric push rod 88, and the third electric push rod 812; the maximum movement distances of the first electric push rod 84, the second electric push rod 88, and the third electric push rod 812 are the same.

[0066] The first determination value P 1 , the second determination value P 2 , and the third determination value P 3 are calculated according to the following formula:

[0067]

[0068] In the above formula, A represents the cross-sectional area of the steel bar to be straightened, S represents the stress of the steel bar to be straightened, F s represents the tensile strength of the steel bar to be straightened, and Y represents the safety factor.

[0069] In the present invention, by providing a first straightening column 85, a second straightening column 89, and a third straightening column 813, pressure sensors are provided on the opposite side walls of the first straightening column 85, the second straightening column 89, and the third straightening column 813. During the straightening process, according to the pressure detection of the three pressure sensors, the extension amount of the corresponding electric push rod is automatically adjusted, so that the straightening effect is better and the straightening operation is more accurate. The present invention is also applicable to steel bars that need to be straightened into an inclined shape. The telescopic rod 7 and the cylinder 12 are provided, and the speed of the cylinder 12 is adjusted by the rotation speed of the motor 6, so that the steel bar to be straightened becomes a uniform inclined state during the straightening process.

[0070] Finally, it should be noted that the above content is only used to illustrate the technical solution of the present invention, rather than limiting the protection scope of the present invention. Any simple modification or equivalent replacement of the technical solution of the present invention by those of ordinary skill in the art does not depart from the essence and scope of the technical solution of the present invention.

Claims

1. A cast-in-place pile steel bar straightening device, characterized in that: It comprises a bottom plate, a frame, a slider, a telescopic rod and a straightening assembly, wherein the upper wall of the bottom plate is fixedly connected to the frame, the side wall of the frame is slidably connected to the slider, the side wall of the slider is fixedly connected to the telescopic rod, and one end of the telescopic rod away from the slider is fixedly connected to the straightening assembly; the straightening assembly comprises a straightening plate, a first straightening column, a second straightening column and a third straightening column, the axes of the first straightening column, the second straightening column and the third straightening column are all arranged perpendicular to the straightening plate, the first straightening column is slidably connected to the straightening plate through a first electric push rod, the second straightening column is slidably connected to the straightening plate through a second electric push rod, and the third straightening column is slidably connected to the straightening plate through a third electric push rod; Pressure sensors are provided on the opposite side walls of the first straightening column, the second straightening column and the third straightening column, and all the pressure sensors, the first electric push rod, the second electric push rod and the third electric push rod are electrically connected to the controller; when the straightening assembly clamps the steel bars to be straightened for size matching, the controller controls the second electric push rod and the third electric push rod to move the second straightening column and the third straightening column to the same vertical line, controls the movement of the first electric push rod, and stops the movement of the first electric push rod when the indications of all the pressure sensors change.

2. A cast-in-place pile reinforcement straightening device according to claim 1, characterized in that: A first pressure sensor is arranged on the side wall of the first straightening column, and the indication of the first pressure sensor is a first pressure value; a second pressure sensor is arranged on the side wall of the second straightening column, and the indication of the second pressure sensor is a second pressure value; a third pressure sensor is arranged on the side wall of the third straightening column, and the indication of the third pressure sensor is a third pressure value; during the straightening process of the steel bars, the controller judges the first pressure value, the second pressure value and the third pressure value collected at each moment, so as to determine whether the first electric push rod, the second electric push rod and the third electric push rod need to move.

3. A cast-in-place pile reinforcement straightening device according to claim 2, characterized in that: Set the first judgment value P 1 , the second judgment value P 2 and the third determination value P 3 , P 1 <P 2 <P 3 The controller calculates the determination calculation value P according to the first pressure value, the second pressure value, and the third pressure value, and compares the determination calculation value with the first determination value, the second determination value, and the third determination value to determine whether the first electric push rod, the second electric push rod, and the third electric push rod need to move. The specific determination method is: The first pressure value, the second pressure value, and the third pressure value at each moment are sorted from small to large; When 0 <P≤P 1 When the controller controls the first electric push rod, the second electric push rod and the third electric push rod not to move; When P 1 <P≤P 2 When the controller only controls the electric push rod to move the distance L1 corresponding to the maximum pressure value; When P 2 <P≤P 3 When the controller controls the electric push rod to move a distance L3 corresponding to the maximum pressure value, controls the electric push rod to move a distance L2 corresponding to the second pressure value, and controls the electric push rod to move a distance L1 corresponding to the third pressure value; Among them, L1 <L2<L3。 4. A cast-in-place pile reinforcement straightening device according to claim 3, characterized in that: The judgment calculation value at the i-th moment is specifically calculated by the following formula: In the above formula, P i represents the judgment calculation value at the i-th moment, P 1i represents the first pressure value at the i-th moment, P 2i represents the second pressure value at the i-th moment, P 3i represents the third pressure value at the i-th moment, α1 represents the correction value of the first pressure sensor, α2 represents the correction value of the second pressure sensor, and α3 represents the correction value of the third pressure sensor.

5. A cast-in-place pile reinforcement straightening device according to claim 4, characterized in that: L1, L2, L3 are calculated according to the following formula: L3=(α1+α3)×L×P i ; In the above formula, L represents the maximum movement distance of the first electric push rod, the second electric push rod and the third electric push rod.

6. A cast-in-place pile reinforcement straightening device according to claim 4, characterized in that: The telescopic rod includes a first connecting rod and a second connecting rod, the second connecting rod is slidably connected inside the first connecting rod, the bottom of the first connecting rod is connected to a cylinder, the output end of the cylinder is connected to the second connecting rod, and the end of the second connecting rod extending out of the first connecting rod is connected to the straightening assembly; during the straightening process, the controller cylinder moves to tilt the steel bars to be straightened.

7. A cast-in-place pile reinforcement straightening device according to claim 6, characterized in that: The side wall of the frame is provided with a slide rail, the slider is slidably connected to the inside of the slide rail, the screw is rotatably connected inside the slide rail, the screw passes through the slider, the upper end of the frame is fixedly connected to a motor, the output end of the motor is fixedly connected to the screw, the motor drives the screw to make the slider move up and down in the slide rail.

8. A cast-in-place pile reinforcement straightening device according to claim 7, characterized in that: The controller controls the movement of the cylinder during the straightening process, and the speed of the cylinder is calculated according to the following formula: in 气 =sinθ×v 电 ; In the above formula, v 气 represents the speed of the cylinder, v 电 represents the speed of the motor, and θ represents the set inclination angle of the steel bar to be straightened.

9. A cast-in-place pile reinforcement straightening device according to claim 8, characterized in that: The controller controls the cylinder to retract at a uniform speed and controls the motor to move at a uniform speed.

10. The cast-in-place pile reinforcement straightening device according to claim 8, characterized in that: The first judgment value P 1 , the second judgment value P 2 and the third determination value P 3 Calculated according to the following formula: In the above formula, A represents the cross-sectional area of ​​the steel bar to be straightened, S represents the stress of the steel bar to be straightened, and F s It represents the tensile strength of the steel bar to be straightened, and Y represents the safety factor.

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