A method and device for detecting a steel cage of a pile foundation

Abstract

The present invention discloses a method and device for detecting a pile foundation steel reinforcement cage, including: a main reinforcement measuring device, a cage body diameter measuring device, and an angle measuring device. The main reinforcement measuring device is used to simultaneously detect the diameters of multiple main reinforcements of the steel reinforcement cage and can adapt to steel reinforcement cages of different diameters. The cage body diameter measuring device is used to measure the diameter of the main body of the steel reinforcement cage while the main reinforcement measuring device is measuring. The angle measuring device is used to measure the included angle between adjacent two main reinforcements to the center of the cage body, and quickly calculate the distance between adjacent two main reinforcements. This method and device for detecting a pile foundation steel reinforcement cage solve the problem that it is difficult to simultaneously detect the diameters of multiple main reinforcements, the spacing, and the diameter of the main body of the steel reinforcement cage when using the existing methods and devices for detecting a pile foundation steel reinforcement cage. The device is simple and fast to operate, can simultaneously measure the diameters of multiple main reinforcements, the diameter of the main body of the steel reinforcement cage, and the distance between adjacent two main reinforcements, and is convenient for folding, telescoping, and storing, facilitating people's use.

Description

Technical Field

[0001] The present invention relates to the technical field of pile foundation reinforcement cage detection, and specifically provides a method and device for detecting pile foundation reinforcement cages. Background Technique

[0002] A deep foundation composed of a pile and a pile cap (referred to as a cap) connecting the top of the pile, or a single-pile foundation connecting a column and a pile foundation, is simply referred to as a pile foundation. If the entire pile body is buried in the soil and the bottom surface of the cap contacts the soil mass, it is called a low-cap pile foundation; if the upper part of the pile body emerges above the ground and the bottom of the cap is above the ground, it is called a high-cap pile foundation. Generally, a reinforcement cage is required for a pile foundation to increase its firmness. The reinforcement cage is produced by intersecting and welding multiple main bars and multiple stirrups.

[0003] The diameter and spacing of the main bars of the reinforcement cage are extremely important detection indicators. When detecting the existing pile foundation reinforcement cage, a measuring ruler is required to measure the diameter of each main bar, the spacing, and the diameter of the main body of the reinforcement cage one by one, which greatly reduces the detection efficiency and is not conducive to the use of workers. For this reason, we propose a method and device for detecting pile foundation reinforcement cages. Summary of the Invention

[0004] The purpose of the present invention is to provide a method and device for detecting pile foundation reinforcement cages that are convenient for simultaneously detecting the diameters of multiple main bars, the spacing, and the diameter of the main body of the reinforcement cage, so as to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A pile foundation reinforcement cage detection device includes: a main bar measuring device, a cage body diameter measuring device, and an angle measuring device. The main bar measuring device is used to simultaneously detect the diameters of multiple main bars of the reinforcement cage, can adapt to reinforcement cages of different diameters, and is convenient for people to fold, store, and carry. The cage body diameter measuring device is used to measure the diameter of the main body of the reinforcement cage while the main bar measuring device is measuring. The angle measuring device is used to measure the angle between adjacent two main bars to the center of the cage body. The spacing between adjacent two main bars can be quickly calculated through the diameter measured by the cage body diameter measuring device. This device is simple and fast to operate, can simultaneously measure the diameters of multiple main bars, the diameter of the main body of the reinforcement cage, and the distance between adjacent two main bars, and is convenient for folding, telescoping, and storing, improving work efficiency and facilitating people's use.

[0006] Preferably, the main reinforcement measuring device includes a first device box, a second device box and a first gear column. First chutes and second chutes are respectively defined in the first device box and the second device box. A first gear rod and a second gear rod are respectively and slidably connected in the first chute and the second chute. The first gear column penetrates through the first device box and the second device box and meshes with both the first gear rod and the second gear rod. An operating device for conveniently operating and measuring the diameter of the main reinforcement is provided at the top end of the first gear column. A limiting disc rotatably connected to the second device box is fixedly connected to the bottom end of the first gear column. Clamping devices for conveniently clamping the main reinforcement in a linkage manner when the first gear rod and the second gear rod extend and touch the main reinforcement are respectively provided at one ends of the first gear rod and the second gear rod, which is convenient for telescopically detecting multiple main reinforcements and can be retracted when the detection is completed, facilitating storage and carrying.

[0007] Preferably, the operating device includes a turntable coaxially and fixedly connected to the first gear column and rotatably connected to the top surface of the first device box. A handle is rotatably connected to the turntable, and the operation is simple and convenient.

[0008] Preferably, the clamping device includes a third device box slidably connected to the first gear rod or the second gear rod. A device slot is defined in the third device box. A second gear column and a third gear column are rotatably connected in the device slot. The second gear column meshes with the first gear rod or the second gear rod. The third gear column meshes with the second gear column. First stoppers are fixedly connected to the bottom ends of the first gear rod and the second gear rod. A first spring fixedly connected to the first stopper is fixedly connected to the bottom surface of the third device box. The second gear column meshes with a first rack. The third gear column meshes with a second rack. A third chute is defined in the first rack. A fourth chute is defined in the second rack. A first clamping block is slidably connected in the third chute. A second clamping block is slidably connected in the fourth chute. A second stopper is fixedly connected to one side of the first rack. A second spring fixedly connected to the second stopper is fixedly connected to one side of the first clamping block. A third stopper is fixedly connected to one side of the second rack. A second spring fixedly connected to the third stopper is fixedly connected to one side of the second clamping block. A scale is fixedly connected to the second clamping block, which is convenient for clamping main reinforcements with any size and any spacing in a linkage manner during telescoping.

[0009] Preferably, the cage diameter measuring device includes scale lines defined on the top surfaces of the first gear rod and the second gear rod. Fourth stoppers for preventing the first gear rod and the second gear rod from disengaging from the first gear column and facilitating the calculation of the initial diameter value are respectively provided at the ends of the first gear rod and the second gear rod far away from the third device box, which is convenient for measuring the diameters of different cages.

[0010] Preferably, the angle measuring device includes an angle measuring scale fixedly connected to one side of the first device box, which is convenient for measuring the central angle degree between two adjacent main bars. Through the arc length calculation formula, arc length = central angle degree * pi * diameter / 360, the arc length distance between two adjacent main bars can be measured.

[0011] Preferably, the second gear column and the third gear column are not at the same height and are meshed with each other in the middle section. The upper section of the second gear column is meshed with the first rack, and the lower section of the third gear column is meshed with the second rack, preventing the first rack and the second rack from colliding with each other when the first clamping block and the second clamping block move.

[0012] Preferably, a fifth sliding groove for slidably connecting with the scale is formed on the third device box, facilitating the more stable sliding of the scale.

[0013] A method for detecting a pile foundation steel reinforcement cage includes the following steps: Step 1, measurement: Rotate the first device box and the second device box by a certain angle, control the operating device to make the clamping devices at both ends of the first device box clamp two main bars with the farthest distance apart respectively, and the clamping devices at both ends of the second device box clamp two adjacent main bars respectively, and continuously rotate the operating device to make the first gear rod and the second gear rod on the first device box extend to the longest; Step 2, reading: The intersection point of the first clamping block and the scale is the diameter of the main bar; the reading of the scale line at the intersection point of the first gear rod, the second gear rod and the third device box; the reading of the scale at the intersection point of the side surface of the second device box and the angle measuring scale is the central angle degree between two adjacent main bars and the center of the circle; Step 3, calculation: Add the readings of the scale lines at the intersection points of the first gear rod, the second gear rod and the third device box, and the diameter of the cage body can be measured; through the arc length calculation formula, arc length = central angle degree * pi * diameter / 360, the arc length distance between two adjacent main bars can be measured; Step 4, storage: Reverse-rotate the operating device, and the detection device can be retracted, and then rotate the first device box and the second device box to coincide, which is convenient for storage and carrying.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] The present invention solves the problem that it is difficult to simultaneously detect the diameters and spacings of multiple main reinforcement bars and the diameter of the main body of a steel reinforcement cage when using existing methods and equipment for detecting steel reinforcement cages of pile foundations. A main reinforcement bar measuring device is provided, which facilitates the simultaneous detection of the diameters of multiple main reinforcement bars of a steel reinforcement cage, can adapt to steel reinforcement cages of different diameters, and is convenient for people to fold, store, and carry. A cage body diameter measuring device is provided, which facilitates the measurement of the diameter of the main body of the steel reinforcement cage while the main reinforcement bar measuring device is measuring. An angle measuring device is provided, which facilitates the measurement of the included angle between adjacent two main reinforcement bars to the center of the cage body. The spacing between adjacent two main reinforcement bars can be quickly calculated through the diameter measured by the cage body diameter measuring device. This device is simple and fast to operate, can simultaneously measure the diameters of multiple main reinforcement bars, the diameter of the main body of the steel reinforcement cage, and the distance between adjacent two main reinforcement bars, and is convenient for folding, telescoping, and storing, improving work efficiency and facilitating people's use. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a schematic diagram when the present invention measures a steel reinforcement cage;

[0018] Figure 3 is a schematic diagram of the structure of the operating device of the present invention;

[0019] Figure 4 is Figure 3 an enlarged view of area A in

[0020] Figure 5 is a cross-sectional view of the main reinforcement bar measuring device of the present invention;

[0021] Figure 6 is Figure 5 an enlarged view of area B in

[0022] Figure 7 is Figure 5 an enlarged view of area C in

[0023] Figure 8 is a schematic diagram of the structure of the clamping device of the present invention;

[0024] Figure 9 is Figure 8 an enlarged view of area D in

[0025] In the figure: 1 - Main reinforcement measuring device; 2 - Cage body diameter measuring device; 3 - Angle measuring device; 4 - First device box; 5 - Second device box; 6 - First gear column; 7 - First chute; 8 - Second chute; 9 - First gear rod; 10 - Second gear rod; 11 - Operating device; 12 - Limit disc; 13 - Clamping device; 14 - Turntable; 15 - Handle; 16 - Third device box; 17 - Device groove; 18 - Second gear column; 19 - Third gear column; 20 - First stop block; 21 - First spring; 22 - First rack; 23 - Second rack; 24 - Third chute; 25 - Fourth chute; 26 - First clamping block; 27 - Second clamping block; 28 - Second stop block; 29 - Second spring; 30 - Third stop block; 31 - Second spring; 32 - Scale; 33 - Scale line; 34 - Fourth stop block; 35 - Angle measuring ruler; 36 - Fifth chute. Detailed implementation manners

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0027] Please refer to Figures 1-9 , the present invention provides a technical solution: a pile foundation steel cage detection device, including: a main reinforcement measuring device 1, a cage body diameter measuring device 2 and an angle measuring device 3. The main reinforcement measuring device 1 is used to detect the diameters of multiple main reinforcements of the steel cage at the same time, can adapt to steel cages of different diameters, and is convenient for people to fold, store and carry. The cage body diameter measuring device 2 is used to measure the diameter of the main body of the steel cage while the main reinforcement measuring device 1 is measuring. The angle measuring device 3 is used to measure the included angle between two adjacent main reinforcements to the center of the cage body. The distance between two adjacent main reinforcements can be quickly calculated through the diameter measured by the cage body diameter measuring device 2. This device is simple and fast to operate, can measure the diameters of multiple main reinforcements, the diameter of the main body of the steel cage and the distance between two adjacent main reinforcements at the same time, and is convenient for folding, telescoping and storing, improving work efficiency and facilitating people's use.

[0028] The main reinforcement measuring device 1 includes a first device box 4, a second device box 5 and a first gear column 6. The first device box 4 and the second device box 5 are both provided with a first slide groove 7 and a second slide groove 8. The first slide groove 7 and the second slide groove 8 are respectively slidably connected with a first gear rod 9 and a second gear rod 10. The first gear column 6 passes through the first device box 4 and the second device box 5, and is meshed with the first gear rod 9 and the second gear rod 10. The top of the first gear column 6 is provided with an operating device 11 for convenient operation of measuring the main reinforcement diameter. The bottom end of the first gear column 6 is fixedly connected with a limit plate 12 rotatably connected to the second device box 5. One end of the first gear rod 9 and the second gear rod 10 are provided with a clamping device 13 which is convenient for clamping the main reinforcement when the first gear rod 9 and the second gear rod 10 are extended to touch the main reinforcement. The operating device 11 is rotated to drive the first gear column 6 to rotate, so that the first gear column 6 simultaneously drives the first gear rod 9 and the second gear rod 10 in the first device box 4 and the second device box 5 to move, so that the four clamping devices 13 can be extended at the same time, and the first device box 4 and the second device box 5 are rotated by a certain angle, so that the diameters of the four main reinforcements can be measured at the same time. When the measurement is completed, the operating device 11 is rotated in the opposite direction to retract the four clamping devices 13 for easy storage.

[0029] The operating device 11 includes a turntable 14 which is coaxially fixedly connected to the first gear column 6 and rotatably connected to the top surface of the first device box 4. A handle 15 is rotatably connected to the turntable 14. Shaking the handle 15 can drive the turntable 14 to rotate, thereby driving the first gear column 6 to rotate. The operation is labor-saving, quick and easy to use.

[0030] The clamping device 13 includes a third device box 16 slidably connected to the first gear rod 9 or the second gear rod 10. A device groove 17 is provided in the third device box 16. A second gear column 18 and a third gear column 19 are rotatably connected in the device groove 17. The second gear column 18 meshes with the first gear rod 9 or the second gear rod 10, and the third gear column 19 meshes with the second gear column 18. First stoppers 20 are fixedly connected to the bottom ends of the first gear rod 9 and the second gear rod 10. A first spring 21 fixedly connected to the first stopper is fixedly connected to the bottom surface of the third device box 16. The second gear column 18 meshes with a first rack 22, and the third gear column 19 meshes with a second rack 23. A third chute 24 is provided in the first rack 22, and a fourth chute 25 is provided in the second rack 23. A first clamping block 26 is slidably connected in the third chute 24, and a second clamping block 27 is slidably connected in the fourth chute 25. A second stopper 28 is fixedly connected to one side of the first rack 22. A second spring 29 fixedly connected to the second stopper is fixedly connected to one side of the first clamping block 26. A third stopper 30 is fixedly connected to one side of the second rack 23. A second spring 29 fixedly connected to the third stopper is fixedly connected to one side of the second clamping block 27. A scale 32 is fixedly connected to the second clamping block 27. When the handle 15 is rotated, the turntable 14 drives the first gear column 6 to rotate, so that the first gear column 6 simultaneously drives the first gear rod 9 and the second gear rod 10 in the first device box 4 and the second device box 5 to move, and the four third device boxes 16 can be extended at the same time. When one side of the third device box 16 touches the main reinforcement, the first gear rod 9 and the second gear rod 10 continue to move forward, and the third device box 16 is blocked by the main reinforcement and cannot move. At this time, the third device box 16 moves in the opposite direction relative to the first gear rod 9 and the second gear rod 10, and the first spring 21 is stretched. The first gear rod 9 and the second gear rod 10 drive the second gear column 18 to rotate, and the second gear column 18 drives the third gear column 19 to rotate, so that the second gear column 18 and the third gear column 19 respectively drive the first rack 22 and the second rack 23 to move towards the middle. The second stopper 28 and the third stopper 30 pull the second spring 29 and the third spring to move, thereby driving the first clamping block 26 and the second clamping block 27 to move and clamp the main reinforcement. Since the diameters of the main reinforcements are not exactly the same, after the first clamping block 26 and the second clamping block 27 at one end clamp the main reinforcement, if the other end has not been clamped yet, the handle 15 can be rotated continuously until all four main reinforcements are clamped. Due to the design of the second spring 29 and the third spring, the situation where the handle 15 cannot be rotated continuously due to the clamping of the main reinforcement at one end and the main reinforcements at other ends cannot be clamped will not occur when clamping. After all four main reinforcements are clamped, the intersection point of the first clamping block 26 and the scale 32 is the diameter of the main reinforcement. After the measurement is completed, rotate the handle 15 in the reverse direction, and the first gear column 6 can be rotated in the reverse direction,Retract the first gear rod 9 and the second gear rod 10, loosen the main reinforcement bars by the first clamping block 26 and the second clamping block 27. After the retraction is completed, rotate the first device box 4 and the second device box 5 to coincide. At this time, the device has a small volume and is convenient for storage. At the same time, this telescopic structure is convenient for measuring main reinforcement bars with different spacings.

[0031] The cage diameter measuring device 2 includes scale lines 33 opened on the top surfaces of the first gear rod 9 and the second gear rod 10. At the ends of the first gear rod 9 and the second gear rod 10 far from the third device box 16, there are fourth stoppers 34 that prevent the first gear rod 9 and the second gear rod 10 from detaching from the first gear column 6 and are convenient for calculating the initial value of the diameter. Continuously rotate the handle 15 to rotate the first gear column 6 to the position of the fourth stopper 34. At this time, the first gear column 6 can no longer rotate, so that the clamping devices 13 at both ends of the first gear rod 9 and the second gear rod 10 respectively clamp two main reinforcement bars with the farthest distance. By reading the sum of the readings of the scale lines 33 at the intersection points of the first gear rod 9, the second gear rod 10 and the third device box 16, the diameter of the cage can be measured.

[0032] The angle measuring device 3 includes an angle measuring scale 35 fixedly connected to one side of the first device box 4. Rotate the first device box 4 and the second device box 5 by a certain angle so that the clamping devices 13 at both ends of the first device box 4 respectively clamp two main reinforcement bars with the farthest distance, and the clamping devices 13 at both ends of the second device box 5 respectively clamp two adjacent main reinforcement bars. The scale at the intersection point of the side surface of the second device box 5 and the angle measuring scale 35 is the central angle degree between the adjacent two main reinforcement bars and the center of the circle. Through the arc length calculation formula, arc length = central angle degree * pi * diameter / 360, the arc length distance between the adjacent two main reinforcement bars can be measured.

[0033] The second gear column 18 and the third gear column 19 are not at the same height and are meshed with each other in the middle section. The upper section of the second gear column 18 is meshed with the first rack 22, and the lower section of the third gear column 19 is meshed with the second rack 23, preventing the first rack 22 and the second rack 23 from moving towards each other and colliding when the second gear column 18 and the third gear column 19 rotate.

[0034] A fifth chute 36 for slidably connecting with the scale 32 is opened on the third device box 16, which is convenient for the scale 32 to slide more stably.

[0035] A method for detecting the steel cage of a pile foundation includes the following steps: Step 1, measurement: Rotate the first device box 4 and the second device box 5 by a certain angle, control the operating device 11 so that the clamping devices 13 at both ends of the first device box 4 respectively clamp the two main steel bars with the farthest distance, and the clamping devices 13 at both ends of the second device box 5 respectively clamp two adjacent main steel bars, and continuously rotate the operating device 11 to extend the first gear rod 9 and the second gear rod 10 on the first device box 4 to the longest; Step 2, reading: The intersection point of the first clamping block 26 and the scale 32 is the diameter of the main steel bar; the readings of the intersection scale lines 33 of the first gear rod 9, the second gear rod 10 and the third device box 16; the intersection scale of the side surface of the second device box 5 and the angle measuring scale 35 is the central angle degree between two adjacent main steel bars and the center of the circle; Step 3, calculation: Add the readings of the intersection scale lines 33 of the first gear rod 9, the second gear rod 10 and the third device box 16 to measure the diameter of the cage body; through the arc length calculation formula, arc length = central angle degree * pi * diameter / 360, the arc length distance between two adjacent main steel bars can be measured; Step 4, storage: Rotate the operating device 11 in the reverse direction, and the detection device can be retracted, and then rotate the first device box 4 and the second device box 5 to coincide, which is convenient for storage and carrying.

[0036] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device.

[0037] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A pile foundation steel cage detection device, characterized in that, include: A main reinforcement measuring device (1), the main reinforcement measuring device (1) is used to simultaneously detect the diameters of a plurality of main reinforcements of a reinforcement cage, can be adapted to reinforcement cages of different diameters, and can be conveniently folded, stored and carried; A cage diameter measuring device (2), the cage diameter measuring device (2) being used to measure the diameter of the reinforcement cage body while the main reinforcement measuring device (1) is measuring; An angle measuring device (3), the angle measuring device (3) is used to measure the angle between two adjacent main bars and the center of the cage body, and the distance between the two adjacent main bars can be quickly calculated through the diameter obtained by the cage body diameter measuring device (2); The main reinforcement measuring device (1) comprises a first device box (4), a second device box (5) and a first gear column (6); the first device box (4) and the second device box (5) are each provided with a first slide groove (7) and a second slide groove (8); the first slide groove (7) and the second slide groove (8) are respectively slidably connected with a first gear rod (9) and a second gear rod (10); one end of the first gear rod (9) and the second gear rod (10) are each provided with a clamping device (13) for clamping the main reinforcement in linkage when the first gear rod (9) and the second gear rod (10) are extended to touch the main reinforcement; The clamping device (13) comprises a third device box (16) slidably connected to the first gear rod (9) or the second gear rod (10), a device groove (17) is provided in the third device box (16), a second gear column (18) and a third gear column (19) are rotatably connected in the device groove (17), the second gear column (18) is meshed with the first gear rod (9) or the second gear rod (10), the third gear column (19) is meshed with the second gear column (18), the bottom ends of the first gear rod (9) and the second gear rod (10) are fixedly connected to a first stopper (20), the bottom surface of the third device box (16) is fixedly connected to a first spring (21) fixedly connected to the first stopper, the second gear column (18) is meshed with a first rack (22), the third gear column (19) is meshed with a second rack (23), the first rack (22) is meshed with a first gear column (23), the first gear column (22) is meshed with a first gear column (23), the first gear column (23) is meshed with a second gear column (23), the first gear column (23) is meshed with a first ... A third slide groove (24) is provided, a fourth slide groove (25) is provided on the second rack (23), a first clamping block (26) is slidably connected in the third slide groove (24), a second clamping block (27) is slidably connected in the fourth slide groove (25), a second stopper (28) is fixedly connected to one side of the first rack (22), one side of the first clamping block (26) is fixedly connected to a second spring (29) fixedly connected to the second stopper (28), a third stopper (30) is fixedly connected to one side of the second rack (23), one side of the second clamping block (27) is fixedly connected to a second spring (29) fixedly connected to the third stopper (30), a scale (32) is fixedly connected to the second clamping block (27), and the cage diameter measuring device (2) comprises scale lines (33) provided on the top surfaces of the first gear rod (9) and the second gear rod (10).

2. The pile foundation steel cage detection device according to claim 1, characterized in that: The first gear column (6) penetrates through the first device box (4) and the second device box (5), and meshes with both the first gear rod (9) and the second gear rod (10). An operating device (11) for facilitating the operation of measuring the diameter of the main reinforcement is provided at the top end of the first gear column (6), and a limiting disk (12) fixedly connected to the bottom end of the first gear column (6) and rotatably connected to the second device box (5) is provided at the bottom end of the first gear column (6).

3. The pile foundation steel cage detection device according to claim 2, characterized in that: The operating device (11) includes a turntable (14) coaxially and fixedly connected to the first gear column (6) and rotatably connected to the top surface of the first device box (4), and a handle (15) is rotatably connected to the turntable (14).

4. The pile foundation steel reinforcement cage detection device according to claim 1, characterized in that: Fourth stoppers (34) for preventing the first gear rod (9) and the second gear rod (10) from detaching from the first gear column (6) and facilitating the calculation of the initial diameter value are provided at the ends of the first gear rod (9) and the second gear rod (10) away from the third device box (16).

5. The pile foundation steel cage detection device according to claim 2, characterized in that: The angle measuring device (3) includes an angle measuring scale (35) fixedly connected to one side of the first device box (4).

6. The pile foundation steel cage detection device according to claim 4, characterized in that: The second gear column (18) and the third gear column (19) are not at the same height and mesh with each other in the middle section. The upper section of the second gear column (18) meshes with the first rack (22), and the lower section of the third gear column (19) meshes with the second rack (23).

7. A pile foundation steel reinforcement cage detection device according to claim 4, characterized in that: A fifth chute (36) for slidably connecting with the scale (32) is provided on the third device box (16).

8. A method for detecting a steel cage of a pile foundation, which uses the device according to any one of claims 5-7, characterized in that: It includes the following steps: Step 1, measurement: Rotate the first device box (4) and the second device box (5) by a certain angle, control the operating device (11) to make the clamping devices (13) at both ends of the first device box (4) clamp the two main reinforcements with the farthest distance apart respectively, and the clamping devices (13) at both ends of the second device box (5) clamp the two adjacent main reinforcements respectively. Continuously rotate the operating device (11) to make the first gear rod (9) and the second gear rod (10) on the first device box (4) extend to the longest; Step 2, reading: The intersection point of the first clamping block (26) and the scale (32) is the diameter of the main reinforcement; the reading of the intersection scale line (33) of the first gear rod (9), the second gear rod (10) and the third device box (16); the intersection scale of the side surface of the second device box (5) and the angle measuring scale (35) is the central angle degree between the two adjacent main reinforcements and the center of the circle; Step 3, calculation: Add the readings of the intersection scale line (33) of the first gear rod (9), the second gear rod (10) and the third device box (16), and the diameter of the cage body can be measured; through the arc length calculation formula, arc length = central angle degree * pi * diameter / 360, the arc length distance between two adjacent main reinforcements can be measured; Step 4, storage: Reverse-rotate the operating device (11), and the detection device can be retracted. Then rotate the first device box (4) and the second device box (5) to coincide, which is convenient for storage and carrying.

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