Tensioning device and method for applying prestress to large-bending-moment concrete pole

Abstract

The invention relates to the field of tensioning devices, in particular to a tensioning device and method for applying prestress to a large-bending-moment concrete electric pole, the tensioning device comprises first supporting seats, mounting rods, a surrounding tensioning mechanism and a positioning clamping mechanism, the left first supporting seat and the right first supporting seat are arranged, and the mounting rods are connected between the front portions and the rear portions of the first supporting seats; a surrounding tensioning mechanism capable of conducting surrounding tensioning on the large-bending-moment concrete electric pole is arranged between the mounting rods, and a positioning and clamping mechanism capable of conducting positioning and clamping on the large-bending-moment concrete electric pole is arranged on the first supporting base on the right portion. A steel bar frame penetrates through a sliding frame to be placed on a second supporting seat, then the sliding frame is slidably adjusted to the corresponding position of the steel bar frame according to the embedding depth of the large-bending-moment concrete electric pole, and the purpose that the position of the sliding frame can be adjusted according to the embedding depth of the concrete electric pole is achieved; therefore, the effect of tension test on concrete poles with different pre-buried depths can be achieved.

Description

Technical Field

[0001] The invention relates to the field of tensioning devices, and in particular to a tensioning device and method for applying prestress to a large bending moment concrete pole. Background Art

[0002] The large bending moment concrete pole tension test is to evaluate the performance and bearing capacity of concrete poles under large bending moments.

[0003] The existing large bending moment concrete pole tension test is to fix one end of the concrete pole sample in a fixture on a tension test machine, and then let the tension test machine apply a predetermined large bending moment load to the other end of the pole to test the tension performance of the large bending moment concrete pole. However, since the position of the fixture on the tension test machine is fixed, when performing the tension test on the concrete pole, it is inconvenient to select the appropriate fixture position for adjustment according to the pre-buried depth data of the concrete pole.

[0004] Therefore, a tensioning device and method for applying prestress to large bending moment concrete poles has been developed, which can adjust the position of the sliding frame according to the pre-embedded depth of the concrete pole, so as to facilitate tensioning tests on concrete poles with different pre-embedded depths. Summary of the invention

[0005] In order to overcome the disadvantage of the existing large-moment concrete pole tensioning test that it is inconvenient to select the appropriate fixing position for adjustment according to the pre-embedded depth data of the concrete pole, the present invention provides a tensioning device and method for applying prestress to large-moment concrete poles, which can adjust the position of the sliding frame according to the pre-embedded depth of the concrete pole, so as to facilitate tensioning tests on concrete poles with different pre-embedded depths.

[0006] The technical solution is: a tensioning device and method for applying prestress to a large-bending-moment concrete pole, comprising a first support seat, a mounting rod, a surrounding tensioning mechanism and a positioning clamping mechanism. The first support seat has two left and right seats, and the mounting rods are connected between the front and rear of the first support seat. A surrounding tensioning mechanism capable of surrounding tensioning the large-bending-moment concrete pole is provided between the mounting rods. A positioning clamping mechanism capable of positioning and clamping the large-bending-moment concrete pole is provided on the right first support seat.

[0007] As a further preferred scheme, the surrounding tensioning mechanism includes an annular guide frame, a movable plate, a first hydraulic cylinder, a connecting plate, a first servo motor, a first U-shaped part, a first hook, a first torsion spring and a control panel. An annular guide frame is connected between the mounting rods, and a movable plate is slidably connected to the annular guide frame. The left and right parts of the movable plate are connected to the first hydraulic cylinder. A connecting plate is connected between the telescopic ends of the first hydraulic cylinder, and a first servo motor is connected to the lower side of the connecting plate. A first U-shaped part is connected to the output shaft of the first servo motor, and a first hook is rotatably connected to the first U-shaped part. A plurality of first torsion springs are connected between the first hook and the first U-shaped part. A control panel is connected to the upper part of the movable plate, and the first servo motor and the first hydraulic cylinder are both connected to the control panel through electric wires. The first hydraulic cylinder is started through the control panel to pull the first hook upward, so that the steel frame is bent to test the tensioning performance of large bending moment concrete poles.

[0008] As a further preferred scheme, the positioning and clamping mechanism includes a second support seat, a guide rod, a sliding frame, a second hydraulic cylinder and an arc-shaped clamping plate. A second support seat is provided on the right side of the right first support seat. Guide rods are connected to the front and rear parts of the second support seat and the first support seat on the right. A sliding frame is slidably connected between the guide rods. The front and rear parts of the sliding frame are connected to the second hydraulic cylinder. Arc-shaped clamping plates are connected to the telescopic ends of the second hydraulic cylinder. The steel frame is placed on the second support seat through the sliding frame. Then, according to the pre-embedded depth of the large bending moment concrete pole, the sliding frame is slidably adjusted to the corresponding position of the steel frame. After the adjustment, the second hydraulic cylinder is started to push the arc-shaped clamping plates closer to each other, so that the arc-shaped clamping plates clamp and fix the steel frame.

[0009] As a further preferred scheme, it also includes a tensioning quick-loading mechanism, which includes a first guide member, a sliding clamping seat, a second servo motor, a second U-shaped member, a second hook, a second torsion spring, a sliding clamping member and a first spring. The lower sides of the left and right parts of the connecting plate are connected to the first guide member, the first guide member is clamped with a sliding clamping seat, the lower side of the sliding clamping seat is connected to the second servo motor, the second servo motor output shaft is connected to the second U-shaped member, the second U-shaped member is rotatably connected to the second hook, and a plurality of second torsion springs are connected between the second hook and the connected second U-shaped member, the left and right sides of the connecting plate are slidably connected to the sliding clamping member, the front and rear parts of the sliding clamping member are connected to the connecting plate with the first spring, when the connecting plate moves downward, the second hook contacts with the steel frame, so that the second hook rotates on the second U-shaped member, and the second hook is hung on the steel frame by the action of the second torsion spring.

[0010] As a further preferred scheme, it also includes a clamping and locking mechanism, which includes a second guide, a sliding rod, a clamping member, a pushing plate and a second spring. The left and right sides of the sliding frame are connected to two front and rear second guides, each of which is slidably connected to a sliding rod, and each of the sliding rods is connected to a clamping member. A pushing plate is connected between two adjacent sliding rods, and the pushing plates are in contact with adjacent arc-shaped clamping plates. A second spring is connected between the second guide and adjacent pushing plates. At this time, the second springs are in a compressed state, and when the arc-shaped clamping plates approach each other, no pressure is applied to the pushing plate, so that the second spring rebounds, driving the sliding rod to slide on the second guide and approach each other, so that the clamping members approach each other until they contact the guide rod.

[0011] As a further preferred scheme, it also includes a rotating lifting mechanism, which includes a fixed plate and a rotating roller. The fixed plates are connected between the left and right parts of the mounting rod, and the annular guide frame is located between the fixed plates. The upper part of the fixed plates is rotatably connected to two front and rear rotating rollers. When the test point of the steel bar frame needs to be adjusted, the steel bar frame is rotated to drive the rotating roller to rotate.

[0012] As a further preferred scheme, it also includes a circumferential moving mechanism, which includes a connecting frame, a third servo motor and a rotating wheel. The left and right sides of the movable plate are connected to the connecting frame, the connecting frame is connected to the third servo motor, the output shaft of the third servo motor is connected to the rotating wheel, the rotating wheels are in contact with the annular guide frame, and the third servo motor on the connecting frame is started to drive the rotating wheel to rotate on the annular guide frame, and the movable plate moves on the annular guide frame through the friction between the rotating wheel and the annular guide frame.

[0013] As a further preferred embodiment, the following steps are also included: S1: placing the steel frame of the large bending moment concrete pole between the first support seats, and after placement, starting the second hydraulic cylinder to push the arc-shaped clamping plates closer to each other so that the arc-shaped clamping plates clamp and fix the steel frame; S2: Start the first hydraulic cylinder to push the connecting plate downward, so that the first hook contacts the steel frame and rotates on the first U-shaped part. Then, the first hook is hung on the steel frame through the force of the first torsion spring. Then, the first hydraulic cylinder is started through the control panel to pull the first hook upward, so that the steel frame bends to test the tensioning performance of the large bending moment concrete pole.

[0014] The present invention has the following advantages: 1. The present invention places the steel frame through the sliding frame on the second support seat, and then slides and adjusts the sliding frame to the corresponding position of the steel frame according to the pre-embedded depth of the large bending moment concrete pole, thereby achieving the effect of being able to adjust the position of the sliding frame according to the pre-embedded depth of the concrete pole, so as to facilitate the tension test of concrete poles with different pre-embedded depths.

[0015] 2. In the present invention, when the connecting plate moves downward, the second hook contacts the steel frame, so that the second hook rotates on the second U-shaped part, and the second hook is hung on the steel frame through the action of the second torsion spring, thereby increasing the stress points of the steel frame and preventing the steel frame from falling off during testing.

[0016] 3. The present invention brings the arc-shaped clamping plates closer to each other while no pressure is applied to the push plate, so that the second spring rebounds, driving the sliding rod to slide closer to each other on the second guide member, so that the clamping members approach each other until they contact the guide rod, thereby achieving the effect of clamping the sliding frame in place and preventing the sliding frame from moving.

[0017] 4. The present invention makes the steel bar frame contact with the rotating roller on the fixed plate. When the test point of the steel bar frame needs to be adjusted, the steel bar frame is rotated to drive the rotating roller to rotate, thereby achieving the effect of being able to lift the steel bar frame and facilitating the adjustment of the test point of the steel bar frame.

[0018] 5. The present invention starts the third servo motor on the connecting frame to drive the rotating wheel to rotate on the annular guide frame. The friction between the rotating wheel and the annular guide frame enables the movable plate to move on the annular guide frame, thereby achieving the effect of enabling the movable plate to move automatically, saving manpower and improving test efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention.

[0020] Figure 2 It is a partial three-dimensional structural schematic diagram of the present invention.

[0021] Figure 3 It is a schematic diagram of the three-dimensional structure of the wrap-around tensioning mechanism of the present invention.

[0022] Figure 4 It is a partial three-dimensional structural schematic diagram of the wrap-around tensioning mechanism of the present invention.

[0023] Figure 5 It is a schematic diagram of the three-dimensional structure of the positioning and clamping mechanism of the present invention.

[0024] Figure 6 It is a partial three-dimensional structural schematic diagram of the positioning and clamping mechanism of the present invention.

[0025] Figure 7 It is a three-dimensional structural schematic diagram of the tensioning quick-installation mechanism of the present invention.

[0026] Figure 8 It is a three-dimensional structural explosion diagram of the tensioning quick-installation mechanism of the present invention.

[0027] Fig. 9 It is a schematic diagram of the three-dimensional structure of the clamping and locking mechanism of the present invention.

[0028] Fig.10 It is a three-dimensional structural schematic diagram of the rotating lifting mechanism and the surrounding moving mechanism of the present invention.

[0029] Among them: 1-first support seat, 2-mounting rod, 3-surrounding tensioning mechanism, 30-annular guide frame, 31-moving plate, 32-first hydraulic cylinder, 33-connecting plate, 34-first servo motor, 35-first U-shaped member, 36-first hook, 37-first torsion spring, 38-control panel, 4-positioning clamping mechanism, 40-second support seat, 41-guide rod, 42-sliding frame, 43-second hydraulic cylinder, 44-arc clamping plate, 5-tensioning quick-installation mechanism, 50-first guide Towards part, 51-sliding card seat, 52-second servo motor, 53-second U-shaped part, 54-second hook, 55-second torsion spring, 56-sliding card member, 57-first spring, 6-clamping card mechanism, 60-second guide member, 61-sliding rod, 62-clamping member, 63-pushing plate, 64-second spring, 7-rotating lifting mechanism, 70-fixed plate, 71-rotating roller, 8-surrounding moving mechanism, 80-connecting frame, 81-third servo motor, 82-rotating wheel. DETAILED DESCRIPTION

[0030] The present invention is further described below in conjunction with specific embodiments. It should also be noted that, unless otherwise clearly specified and limited, terms such as: setting, installing, connecting, and connecting should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] A tensioning device and method for applying prestress to a large bending moment concrete pole, such as Figure 1 and Figure 2 As shown, it includes a first support seat 1, a mounting rod 2, a surrounding tensioning mechanism 3 and a positioning clamping mechanism 4. The first support seat 1 has two left and right parts. The mounting rods 2 are connected between the front and rear parts of the first support seat 1. The surrounding tensioning mechanism 3 is arranged between the mounting rods 2, and the positioning clamping mechanism 4 is arranged on the right first support seat 1.

[0032] like Figure 1 , Figure 3 and Figure 4 As shown, the surrounding tensioning mechanism 3 includes an annular guide frame 30, a movable plate 31, a first hydraulic cylinder 32, a connecting plate 33, a first servo motor 34, a first U-shaped member 35, a first hook 36, a first torsion spring 37 and a control screen 38. The annular guide frame 30 is connected between the mounting rods 2, the movable plate 31 is slidably connected to the annular guide frame 30, the left and right parts of the movable plate 31 are connected to the first hydraulic cylinder 32, a connecting plate 33 is connected between the telescopic ends of the first hydraulic cylinder 32, the lower side of the connecting plate 33 is connected to the first servo motor 34, the first U-shaped member 35 is connected to the output shaft of the first servo motor 34, the first U-shaped member 35 is rotatably connected to the first hook 36, two first torsion springs 37 are connected between the first hook 36 and the first U-shaped member 35, the upper part of the movable plate 31 is connected to the control screen 38, and the first servo motor 34 and the first hydraulic cylinder 32 are connected to the control screen 38 through wires.

[0033] like Figure 1 , Figure 5 and Figure 6 As shown, the positioning and clamping mechanism 4 includes a second support seat 40, a guide rod 41, a sliding frame 42, a second hydraulic cylinder 43 and an arc-shaped clamping plate 44. The second support seat 40 is provided on the right side of the right first support seat 1. The front and rear parts of the second support seat 40 are both connected to the right first support seat 1 with a guide rod 41. The sliding frame 42 is slidably connected between the guide rods 41. The front and rear parts of the sliding frame 42 are both connected to the second hydraulic cylinder 43. The arc-shaped clamping plate 44 is connected to the telescopic end of the second hydraulic cylinder 43.

[0034] When using the present invention, first place the first support seat 1 in the large bending moment concrete pole production area, and then place the steel frame of the large bending moment concrete pole between the first support seats 1. After placement, slide and adjust the position of the movable plate 31 on the annular guide frame 30, and then start the first hydraulic cylinder 32 to push the connecting plate 33 downward, so that the first hook 36 contacts the steel frame, so that the first hook 36 rotates on the first U-shaped part 35, and then the first torsion spring 37 is used to hang the first hook 36 on the steel frame, and then the first hydraulic cylinder 32 is started through the control panel 38 to pull the first hook 36 upward to bend the steel frame to test the tensioning performance of the large bending moment concrete pole. After the test, the control panel 38 can be started The first servo motor 34 is driven to adjust the direction of the first hook 36 so that the first hook 36 can be separated from the steel frame. When the steel frame of the large bending moment concrete pole is tested, the steel frame can be placed on the second support seat 40 through the sliding frame 42. Then, according to the pre-embedded depth of the large bending moment concrete pole, the sliding frame 42 is slid and adjusted to the corresponding position of the steel frame. The guide rod 41 guides the sliding frame 42. After the adjustment, the second hydraulic cylinder 43 is started to push the arc clamping plates 44 closer to each other, so that the arc clamping plates 44 clamp and fix the steel frame, thereby playing a role in being able to adjust the position of the sliding frame 42 according to the pre-embedded depth of the concrete pole, so as to facilitate the tension test of concrete poles with different pre-embedded depths.

[0035] like Figure 1 , Figure 7 and Figure 8 As shown, it also includes a tensioning quick-loading mechanism 5, which includes a first guide member 50, a sliding clamping seat 51, a second servo motor 52, a second U-shaped member 53, a second hook 54, a second torsion spring 55, a sliding clamping member 56 and a first spring 57. The lower sides of the left and right parts of the connecting plate 33 are connected to the first guide member 50, the sliding clamping seat 51 is clamped on the first guide member 50, the lower side of the sliding clamping seat 51 is connected to the second servo motor 52, the second U-shaped member 53 is connected to the output shaft of the second servo motor 52, the second U-shaped member 53 is rotatably connected to the second hook 54, and two second torsion springs 55 are connected between the second hook 54 and the connected second U-shaped member 53, the left and right sides of the connecting plate 33 are slidably connected to the sliding clamping member 56, and the front and rear parts of the sliding clamping member 56 are connected to the connecting plate 33 with the first spring 57.

[0036] The tensioning quick-install mechanism 5 of the present device can increase the stress points of the steel frame, push the sliding clamping seat 51 into the first guide member 50, and the sliding clamping seat 51 squeezes the sliding clamping member 56 to move upward. When the sliding clamping seat 51 is completely pushed into the first guide member 50, the sliding clamping member 56 is moved downward and reset by the force of the first spring 57, so that the sliding clamping member 56 limits the sliding clamping seat 51. When the connecting plate 33 moves downward, the second hook 54 contacts the steel frame, so that the second hook 54 rotates on the second U-shaped member 53, and the second hook 54 is hung on the steel frame by the force of the second torsion spring 55, thereby increasing the stress points of the steel frame and preventing the steel frame from falling off during testing. After the test, the second servo motor 52 is started to adjust the direction of the second hook 54 so that the second hook 54 can be separated from the steel frame.

[0037] like Figure 1 and Fig. 9 As shown, it also includes a clamping and locking mechanism 6, which includes a second guide member 60, a sliding rod 61, a clamping member 62, a pushing plate 63 and a second spring 64. The left and right sides of the sliding frame 42 are connected to the front and rear second guide members 60, the second guide members 60 are slidably connected to the sliding rods 61, the sliding rods 61 are connected to the clamping members 62, and the pushing plates 63 are connected between the two adjacent sliding rods 61. The pushing plates 63 are in contact with the adjacent arc-shaped clamping plates 44, and the second guide members 60 are connected to the adjacent pushing plates 63 with second springs 64. At this time, the second springs 64 are in a compressed state.

[0038] By using the clamping and locking mechanism 6 of the present device, the sliding frame 42 can be clamped and locked. When the arc-shaped clamping plates 44 are close to each other, no pressure is applied to the pushing plate 63, so that the second spring 64 rebounds, driving the sliding rod 61 to slide close to each other on the second guide member 60, so that the clamping members 62 are close to each other until they contact the guide rod 41, thereby clamping and locking the sliding frame 42 to prevent the sliding frame 42 from moving.

[0039] like Figure 1 and Fig.10 As shown, it also includes a rotating lifting mechanism 7, which includes a fixed plate 70 and a rotating roller 71. The fixed plates 70 are connected between the left and right parts of the mounting rod 2, and the annular guide frame 30 is located between the fixed plates 70. The upper part of the fixed plates 70 is rotatably connected to two front and rear rotating rollers 71.

[0040] The rotating support mechanism 7 of the device can be used to support the steel frame. When the steel frame of the large bending moment concrete pole is placed between the first support seats 1, the steel frame contacts the rotating roller 71 on the fixed plate 70. When the test point of the steel frame needs to be adjusted, the steel frame is rotated to drive the rotating roller 71 to rotate, thereby supporting the steel frame and facilitating the adjustment of the test point of the steel frame.

[0041] like Figure 1 and Fig.10 As shown, it also includes a surrounding moving mechanism 8, which includes a connecting frame 80, a third servo motor 81 and a rotating wheel 82. The connecting frames 80 are connected to the left and right sides of the moving plate 31, and the third servo motor 81 is connected to the connecting frame 80. The output shaft of the third servo motor 81 is connected to the rotating wheel 82, and the rotating wheel 82 is in contact with the annular guide frame 30.

[0042] By using the surrounding moving mechanism 8 of the present device, the moving plate 31 can be automatically moved. After the first hook 36 and the second hook 54 are hung on the steel frame, the third servo motor 81 on the connecting frame 80 is started to drive the rotating wheel 82 to rotate on the annular guide frame 30. The friction between the rotating wheel 82 and the annular guide frame 30 allows the moving plate 31 to move on the annular guide frame 30, thereby enabling the moving plate 31 to be automatically moved, saving manpower and improving testing efficiency.

[0043] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of implementation of the present invention. Therefore, any equivalent changes made to the contents described in the claims of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A tensioning device for applying prestress to a large bending moment concrete pole, characterized in that it comprises A first support seat (1), a mounting rod (2), a wrap-around tensioning mechanism (3) and a positioning clamping mechanism (4) are provided. The first support seat (1) has two left and right sides. The front and rear sides of the first support seat (1) are both connected with the mounting rod (2). The wrap-around tensioning mechanism (3) capable of wrapping around and tensioning a large bending moment concrete pole is provided between the mounting rods (2). The right first support seat (1) is provided with a positioning clamping mechanism (4) capable of positioning and clamping the large bending moment concrete pole.

2. A tensioning device for applying prestress to a large bending moment concrete pole as claimed in claim 1, characterized in that: The surrounding tensioning mechanism (3) comprises an annular guide frame (30), a movable plate (31), a first hydraulic cylinder (32), a connecting plate (33), a first servo motor (34), a first U-shaped member (35), a first hook (36), a first torsion spring (37) and a control panel (38); the annular guide frame (30) is connected between the mounting rods (2); the movable plate (31) is slidably connected to the annular guide frame (30); the left and right parts of the movable plate (31) are both connected to the first hydraulic cylinder (32); the connecting plate (33) is connected between the telescopic ends of the first hydraulic cylinder (32); the lower side of the connecting plate (33) is connected to the first servo motor (34), a first U-shaped member (35) is connected to the output shaft of the first servo motor (34), a first draw hook (36) is rotatably connected to the first U-shaped member (35), a plurality of first torsion springs (37) are connected between the first draw hook (36) and the first U-shaped member (35), a control panel (38) is connected to the upper part of the movable plate (31), the first servo motor (34) and the first hydraulic cylinder (32) are both connected to the control panel (38) through electric wires, and the first hydraulic cylinder (32) is activated through the control panel (38) to pull the first draw hook (36) to move upward, so that the steel frame is bent, so as to test the tensioning performance of the large bending moment concrete pole.

3. A tensioning device for applying prestress to a large bending moment concrete pole as claimed in claim 2, characterized in that: The positioning and clamping mechanism (4) comprises a second support seat (40), a guide rod (41), a sliding frame (42), a second hydraulic cylinder (43) and an arc-shaped clamping plate (44); the second support seat (40) is provided on the right side of the first support seat (1); the guide rod (41) is connected between the front and rear parts of the second support seat (40) and the first support seat (1); the sliding frame (42) is slidably connected between the guide rods (41); the front and rear parts of the sliding frame (42) are connected to the second hydraulic cylinder (43); the telescopic end of the second hydraulic cylinder (43) is connected to the arc-shaped clamping plate (44); the steel bar frame is passed through the sliding frame (42) and placed on the second support seat (40); then, according to the pre-embedded depth of the large bending moment concrete pole, the sliding frame (42) is slidably adjusted to the corresponding position of the steel bar frame; after the adjustment is completed, the second hydraulic cylinder (43) is started to push the arc-shaped clamping plates (44) to approach each other, so that the arc-shaped clamping plates (44) clamp and fix the steel bar frame.

4. A tensioning device for applying prestress to a large bending moment concrete pole as claimed in claim 3, characterized in that: The invention also comprises a tensioning quick-installation mechanism (5), which comprises a first guide member (50), a sliding clamping seat (51), a second servo motor (52), a second U-shaped member (53), a second draw hook (54), a second torsion spring (55), a sliding clamping member (56) and a first spring (57). The lower sides of the left and right parts of the connecting plate (33) are both connected to the first guide member (50), the sliding clamping seat (51) is clamped on the first guide member (50), the lower side of the sliding clamping seat (51) is both connected to the second servo motor (52), the output shaft of the second servo motor (52) is both connected to the second U-shaped member (53), and the second U-shaped member (56) is connected to the output shaft of the second servo motor (52). The parts (53) are all rotatably connected with second hooks (54), and a plurality of second torsion springs (55) are connected between the second hooks (54) and the second U-shaped parts (53) connected thereto. The left and right sides of the connecting plate (33) are slidably connected with sliding clamping parts (56), and the front and rear parts of the sliding clamping parts (56) are both connected with the first springs (57) between the connecting plate (33). When the connecting plate (33) moves downward, the second hooks (54) contact the steel frame, so that the second hooks (54) rotate on the second U-shaped parts (53), and the second hooks (54) are hung on the steel frame through the action of the second torsion springs (55).

5. A tensioning device for applying prestress to a large bending moment concrete pole as claimed in claim 4, characterized in that: The invention also comprises a clamping and locking mechanism (6), which comprises a second guide member (60), a sliding rod (61), a clamping member (62), a pushing plate (63) and a second spring (64). The left and right sides of the sliding frame (42) are connected to two front and rear second guide members (60), the second guide members (60) are slidably connected to the sliding rod (61), the sliding rod (61) is connected to the clamping member (62), and the pushing plate (63) is connected between two adjacent sliding rods (61). The plates (63) are in contact with the adjacent arc-shaped clamping plates (44), and the second guide members (60) are connected with the adjacent push plates (63) by second springs (64). At this time, the second springs (64) are in a compressed state. When the arc-shaped clamping plates (44) are close to each other, they no longer apply pressure to the push plates (63), so that the second springs (64) rebound, driving the sliding rods (61) to slide on the second guide members (60) and approach each other, so that the clamping members (62) approach each other until they contact the guide rods (41).

6. A tensioning device for applying prestress to a large bending moment concrete pole as claimed in claim 5, characterized in that: The invention also comprises a rotating lifting mechanism (7), the rotating lifting mechanism (7) comprising a fixed plate (70) and a rotating roller (71), the fixed plate (70) being connected between the left and right parts of the mounting rod (2), the annular guide frame (30) being located between the fixed plates (70), the upper part of the fixed plate (70) being rotatably connected to two front and rear rotating rollers (71), and when it is necessary to adjust the test point of the steel bar frame, the steel bar frame is rotated to drive the rotating roller (71) to rotate.

7. A tensioning device for applying prestress to a large bending moment concrete pole as claimed in claim 6, characterized in that: The movable plate (31) further comprises an circumferential movement mechanism (8), the circumferential movement mechanism (8) comprising a connecting frame (80), a third servo motor (81) and a rotating wheel (82). The left and right sides of the movable plate (31) are connected to the connecting frame (80), the connecting frame (80) is connected to the third servo motor (81), the output shaft of the third servo motor (81) is connected to the rotating wheel (82), the rotating wheel (82) is in contact with the annular guide frame (30), the third servo motor (81) on the connecting frame (80) is started, the rotating wheel (82) is driven to rotate on the annular guide frame (30), and the movable plate (31) is moved on the annular guide frame (30) by the friction between the rotating wheel (82) and the annular guide frame (30).

8. A method for using a tensioning device for applying prestress to a large bending moment concrete pole according to any one of claims 1 to 7, characterized in that: The following steps are also included: S1: placing the steel frame of the large bending moment concrete pole between the first support seats (1), and after placement, starting the second hydraulic cylinder (43) to push the arc-shaped clamping plates (44) closer to each other so that the arc-shaped clamping plates (44) clamp and fix the steel frame; S2: Start the first hydraulic cylinder (32) to push the connecting plate (33) downward, so that the first hook (36) contacts the steel frame and rotates on the first U-shaped member (35). Then, the first hook (36) is hung on the steel frame through the action of the first torsion spring (37). Then, the first hydraulic cylinder (32) is started through the control panel (38) to pull the first hook (36) upward, so that the steel frame bends, so as to test the tensioning performance of the large bending moment concrete pole.

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