Parallel steel wire cable-stayed bridge tension and compression combined traction device

Abstract

The parallel steel wire stay cable tension and compression combined traction device for cable-stayed bridge in the field of cable-stayed cable traction construction technology, which comprises multiple sets of rectifying mechanisms arranged in a circumferential array, multiple rectifying mechanisms are movably connected through connecting pieces, the rectifying mechanism comprises a supporting plate, a mounting block is slidably connected with the supporting plate in the vertical direction, a rectifying plate is rotatably connected with the mounting block, a torsional spring one for resetting the rectifying plate is sleeved on the rotating shaft, a positioning roller is rotatably installed on the inner side of the supporting plate, a driving unit is arranged on the supporting plate and used for driving the rectifying plate to be inserted into an anchor hole of an anchor device, so as to adjust the position of the supporting plate, make the positioning roller tangent to the anchor clamp piece hole, and a locking unit is movably installed on the supporting plate, the locking unit can relatively fix the supporting plate and the anchor device after the position adjustment of the supporting plate is completed, and the steel strand tensioning is completed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of stay cable traction construction, in particular to a parallel steel wire stay cable tension and compression combined traction device for a cable-stayed bridge. BACKGROUND

[0002] During the installation of the stay cable of a cable-stayed bridge, the steel strand needs to be prestressed and tensioned by a tensioning jack after the steel strand passes through the anchorage device, and then the clamping piece is pressed into the anchor hole of the anchorage device to fix the steel strand. Figure 1 As shown in the drawings, in the ideal state, the through hole on the support of the tensioning jack is coaxial with the anchor hole of the anchorage device, and the steel strand can be tensioned along the c2 trajectory when the tensioning jack is tensioning the steel strand. However, in the actual operation process, the support of the tensioning jack is threadedly connected with the anchorage device, and after the support and the anchorage device are locked, the coaxial state of the through hole on the support and the anchor hole cannot be guaranteed, and there will be an axial distance L between them. The actual machining error of the support and the anchorage device will further increase the axial distance L. When the tensioning jack is tensioning the steel strand, the actual tensioning direction of the steel strand is c1, and after the steel strand is inclined to the right, the pressure applied to the right clamping piece will greatly increase, and conversely, the pressure applied to the left clamping piece will greatly decrease. When the clamping piece is pressed into the anchor hole after the tensioning of the steel strand is completed, the right clamping piece is difficult to press, the left clamping piece is easy to press, and the top of the two clamping pieces pressed into the anchor hole cannot be guaranteed to be flush, which greatly reduces the locking effect on the steel strand. SUMMARY

[0003] The purpose of the present application is to provide a parallel steel wire stay cable tension and compression combined traction device for a cable-stayed bridge to solve the problems raised in the background.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a parallel steel wire stay cable tension and compression combined traction device for a cable-stayed bridge, comprising a plurality of rectification mechanisms arranged in a circumferential array; a plurality of rectification mechanisms are movably connected through a connecting piece; the rectification mechanism comprises a support plate; a mounting block is slidably connected with the support plate in the vertical direction; a rectification plate is rotatably connected with the mounting block, and a torsional spring one for resetting the rectification plate is sleeved on the rotation shaft; a positioning roller is rotatably installed on the inner side of the support plate; a driving unit is provided on the support plate and is used to drive the rectification plate to insert into the anchor hole of the anchorage device, so as to adjust the position of the support plate and make the positioning roller tangent to the clamping piece hole of the anchorage device; a locking unit is movably installed on the support plate, and the locking unit can relatively fix the support plate and the anchorage device after the position adjustment of the support plate is completed.

[0005] As a further scheme of the present application, the driving unit comprises: a suction cup, which is slidingly connected with the support plate in the vertical direction; a piston, which is slidingly connected with the suction cup; a pressing plate, which is fixedly installed on the top of the piston; an electric telescopic cylinder, the fixed end of which is fixedly connected with the support plate, and the output end of which is fixedly connected with the pressing plate; and a switch valve, which is arranged on the side wall of the suction cup and is used for controlling the exhaust of the piston.

[0006] As a further scheme of the present application, the switch valve comprises: a sealing block, which is elastically slidingly connected with the suction cup; and a top rod, which is obliquely arranged and is hingedly connected with the sealing block at the top end and is located below the suction cup at the bottom end.

[0007] As a further scheme of the present application, the locking unit comprises: a spring one, which is fixed with the mounting block and is used for resetting the mounting block; a wedge-shaped pressing block, which is elastically slidingly installed on the top of the suction cup and can drive the mounting block to move downward along with the suction cup; and a wedge-shaped push rod, which is fixedly connected with the pressing plate and is located directly above the wedge-shaped pressing block.

[0008] As a further scheme of the present application, a limiting block is fixedly connected with the rotating shaft of the correcting plate, and a limiting slot is arranged on the mounting block and is slidingly matched with the limiting block.

[0009] As a further scheme of the present application, a support is rotatably connected with the support plate; a torsional spring two is sleeved on the rotating shaft of the support and is used for resetting the support; and a guide roller is rotatably installed on the support and is located above the positioning roller.

[0010] As a further scheme of the present application, a pressing rod is slidingly connected with the support plate in the vertical direction, a spring two is fixedly connected with the pressing rod, and the top end of the spring two is fixedly connected with the support plate; a steel rope is fixedly connected with the pressing rod, one end of the steel rope away from the pressing rod penetrates through the support plate and is fixedly connected with a sliding block, the sliding block is slidingly connected with the support plate in the vertical direction, a pull hook capable of driving the sliding block to move downward is arranged on the side edge of the sliding block, the pull hook is rotatably connected with the pressing plate, a gear is connected with the rotating shaft of the pull hook through a one-way bearing, and a rack is fixedly connected with the top of the suction cup and can be engaged with the gear.

[0011] As a further scheme of the present application, the connecting piece comprises a plurality of fixed sleeves and a plurality of sliding rods, the number of the fixed sleeves and the sliding rods is the same as the number of the support plates, the fixed sleeves are fixedly connected with the support plates, and the sliding rods are movably connected with the fixed sleeves.

[0012] As a further scheme of the present application, the support plate is arranged in an arc shape.

[0013] Compared with the prior art, the present application has the following beneficial effects:

[0014] Through the setting of the correcting mechanism, the steel strand located below the positioning roller can be ensured to be in parallel with the anchor hole during the tensioning process, the pressing process of the clamping piece can be more smooth after the subsequent steel strand tensioning is completed, and the top ends of the two clamping pieces can be kept flat, and the clamping effect on the steel strand can be more stable. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 ILLUSTRATION FOR THE BACKGROUND OF THE INVENTION;

[0016] Figure 2 SCHEMATIC DIAGRAM OF THE OVERALL STRUCTURE OF THE INVENTION;

[0017] Figure 3 SCHEMATIC DIAGRAM OF THE SUPPORTING PLATE AND STRUCTURE THEREON;

[0018] Figure 4 SCHEMATIC DIAGRAM OF THE LOCKING UNIT STRUCTURE;

[0019] Figure 5 SCHEMATIC DIAGRAM OF THE DRIVING UNIT STRUCTURE;

[0020] Figure 6 SCHEMATIC DIAGRAM OF THE PRESSING ROD AND RELATED STRUCTURE;

[0021] Figure 7 SCHEMATIC DIAGRAM OF THE CONNECTING PIECE STRUCTURE;

[0022] Figure 8 SCHEMATIC DIAGRAM OF THE WORKING STATE OF THE CONNECTING PIECE;

[0023] Figure 9 SCHEMATIC DIAGRAM OF THE WORKING STATE OF THE TENSIONING JACK;

[0024] Figure 10 SCHEMATIC DIAGRAM OF THE OVERALL WORKING STATE OF THE INVENTION.

[0025] REFERENCE SIGNS ARE AS FOLLOWS:

[0026] 1 - supporting plate, 2 - correcting plate, 3 - mounting block, 4 - positioning roller, 5 - guide roller, 6 - locking unit 6, 7 - suction cup, 8 - piston, 9 - pressing plate, 10 - electric telescopic cylinder, 11 - sealing block, 12 - top rod, 13 - spring one, 14 - wedge-shaped pressing block, 15 - wedge-shaped pushing rod, 16 - limiting block, 17 - limiting groove, 18 - pressing rod, 19 - spring two, 20 - steel rope, 21 - pull hook, 22 - sliding block, 23 - gear, 24 - rack, 25 - connecting piece, 26 - fixed sleeve, 27 - sliding rod, 28 - tensioning jack, 29 - support, 30 - driving unit. DETAILED DESCRIPTION

[0027] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0028] Please refer to Figures 1-10 , the figure a indicates the anchor, b indicates the jack support, c indicates the steel strand, d indicates the clamping piece; the present application provides a technical solution: parallel steel wire cable-stayed cable tension and compression combination traction device for cable-stayed bridge, including tensioning jack 28 and multiple sets of correction mechanism arranged in a circumferential array; multiple correction mechanisms are movably connected through connecting piece 25; the correction mechanism includes support plate 1, correction plate 2, mounting block 3, positioning roller 4, drive unit 30 and locking unit 6; mounting block 3 is slidably connected with support plate 1 in the vertical direction; correction plate 2 is rotatably connected with mounting block 3, and a torsional spring I for resetting is sleeved on the rotating shaft; positioning roller 4 is rotatably installed on the inner side of support plate 1; drive unit 30 is arranged on support plate 1 and is used to drive correction plate 2 to insert into the anchor hole of anchor, so as to adjust the position of support plate 1, so that positioning roller 4 is tangent to the clamping piece hole of anchor; locking unit 6 is movably installed on support plate 1, and locking unit 6 can relatively fix support plate 1 and anchor after adjusting the position of support plate 1 to complete correction.

[0029] In the present embodiment, the correction mechanism is provided in three groups, the steel strand is pre-fixed through the anchor hole and the clamping piece, then the three groups of correction mechanisms are installed between the anchor and the jack support, so that the steel strand is inside the multiple correction mechanisms, then the three groups of correction mechanisms are relatively fixed through connecting piece 25; the tensioning jack 28 is installed on the jack support, the top end of the steel strand passes through the tensioning jack 28, then the tensioning jack 28 performs tensioning operation on the steel strand; as Figure 10As shown, in the initial position, the clamp is located inside the anchor hole; when the steel strand is tensioned, the top of the steel strand moves upward, and the clamp moves upward synchronously with the steel strand. When the clamp rises, if the straightening plate 2 is within its path, the clamp forces the straightening plate 2 to rotate towards the support plate 1 through contact, preventing the straightening plate 2 from obstructing the upward movement of the clamp; after the clamp moves out of the anchor hole, the tensioning jack 28 stops working. At this time, the top of the steel strand is not fully taut and is clamped by the tensioning jack 28; the locking unit 6 moves downward, and at the same time, the driving unit 30 drives the mounting block 3 and the straightening plate 2 to move downward, straightening... After the bottom end of plate 2 enters the anchor hole, the inner wall of the anchor hole drives the straightening plate 2 to rotate until the inner wall of the straightening plate 2 is completely in contact with the inner wall of the anchor hole. At this time, the straightening plate 2 rotates to its limit position and is fixed relative to the mounting block 3. Then, as the straightening plate 2 continues to move downward, the inner wall of the anchor hole drives the straightening plate 2 to move the support plate 1 horizontally towards the side closer to the anchor hole axis. When the straightening plate 2 moves downward to its limit position, the three support plates 1 are arranged in a circular array about the center of the anchor hole. At this time, the three positioning rollers 4 are also arranged in a circular array about the center of the anchor hole. The three positioning rollers 4 radially constrain the steel in a circular array. The strand is tensioned to ensure it is parallel to the anchor hole axis; the locking unit 6 fixes the support plate 1 relative to the anchor; the drive unit 30 drives the straightening plate 2 and the mounting block 3 to move upward and exit the anchor hole, returning to the initial position, so as to prevent the straightening plate 2 from obstructing the insertion of the clamp into the anchor hole after the subsequent tensioning of the steel strand; then the tensioning jack 28 works again, and under the action of the three positioning rollers 4, the part of the steel strand located below the three positioning rollers 4 always remains parallel to the anchor hole. After the steel strand is tensioned, the construction personnel can push the clamp into the anchor hole; because the steel strand is parallel to the anchor hole, the clamp... The pressing process of the clamping plates can be smoother, and the tops of the two clamping plates can be kept flat, which can make the clamping effect on the steel strand more stable. The tensioning jack 28 releases the steel strand, and the steel strand retracts, which drives the clamping plates to tighten and fix the steel strand. After the steel strand tensioning is completed, the connecting piece 25 connecting the straightening mechanism is removed, and then the straightening mechanism is dismantled. It should be noted that the height of the support plate 1 can be set to be equal to or slightly less than the distance between the anchor and the jack support, which can prevent the support plate 1 from tilting after the straightening mechanism is installed between the anchor and the jack support.

[0030] Specifically, such as Figure 4 As shown, the locking unit 6 includes a suction cup 7, a piston 8, a pressure plate 9, an electric telescopic cylinder 10, and a switching valve; the suction cup 7 is slidably connected to the support plate 1 in the vertical direction; the piston 8 is slidably connected to the suction cup 7; the pressure plate 9 is fixedly installed on the top of the piston 8; the fixed end of the electric telescopic cylinder 10 is fixedly connected to the support plate 1, and the output end is fixedly connected to the pressure plate 9; the switching valve is located on the side wall of the suction cup 7 and is used to control the exhaust of the piston 8.

[0031] When the locking unit 6 is working, the electric telescopic cylinder 10 drives the pressure plate 9 to move downwards, and the pressure plate 9 drives the piston 8 to move downwards synchronously. Since the switch valve is in the closed state at this time, the air inside the suction cup 7 is sealed, and the piston 8 and the suction cup 7 are in a relatively fixed state. The piston 8 drives the suction cup 7 to move downwards synchronously; until the suction cup 7 moves downwards to fit against the anchor, at which point the switch valve opens, and the piston 8 moves downwards relative to the suction cup 7; Figure 4 As shown in the figure, the shaded area represents the chamber inside the suction cup 7 that connects to the bottom. When the piston 8 moves downward, the volume of the chamber inside the suction cup 7 increases, creating a negative pressure inside. Due to this negative pressure, the suction cup 7 adheres tightly to the top surface of the anchor. Under the action of the suction cup 7, the support plate 1 and the anchor are in a relatively fixed state. After the tensioning of the steel strand is completed, when the locking unit 6 needs to release the fixation of the support plate 1, the electric telescopic cylinder 10 drives the pressure plate 9 and piston 8 to move upward to the initial position. After this, the suction force of the suction cup 7 disappears, and then the piston 8 can drive the suction cup 7 to move upward. Since the position of the support plate 1 needs to be adjusted after it is installed between the anchor and the jack support, the support plate 1 needs to perform a translational movement, such as... Figure 2 As shown, in the initial state, the bottom surface of the suction cup 7 is located above the bottom surface of the support plate 1. During the adjustment phase of the support plate 1, the bottom surface of the suction cup 7 is always higher than the top surface of the anchor to avoid damage to the sealing surface of the suction cup 7 by translational friction. Only after the position of the support plate 1 is adjusted can the suction cup 7 contact the top surface of the anchor.

[0032] Specifically, such as Figure 4 As shown, the switching valve includes a sealing block 11 and a push rod 12; the sealing block 11 is elastically slidably connected to the suction cup 7; the push rod 12 is inclined and its top end is hinged to the sealing block 11, and its bottom end is located below the suction cup 7.

[0033] As the suction cup 7 moves downward, it drives the push rod 12 to move downward synchronously. The bottom end of the push rod 12 first contacts the top surface of the anchor. After contacting the top of the anchor, the push rod 12 pushes open the sealing block 11. When the suction cup 7 is completely attached to the top surface of the anchor, the piston 8 continues to move downward. The internal cavity volume of the suction cup 7 increases, generating negative pressure, thereby achieving adsorption and fixation. Through the setting of the switching valve, in the initial stage of the piston 8 moving downward, the switching valve is in the closed state because the sealing block 11 has not been pushed open, and the piston 8 and the suction cup 7 move downward synchronously. After the push rod 12 pushes open the sealing block 11, the switching valve opens, and the piston 8 moves downward relative to the suction cup 7, forming negative pressure inside the suction cup 7.

[0034] Specifically, such as Figure 5 As shown, the drive unit 30 includes a spring 13, a wedge-shaped pressure block 14, and a wedge-shaped push rod 15; the spring 13 is fixed to the mounting block 3 and is used to reset the mounting block 3; the wedge-shaped pressure block 14 is elastically slidably mounted on the top of the suction cup 7 and can drive the mounting block 3 to move downward with the suction cup 7; the wedge-shaped push rod 15 is fixedly connected to the pressure plate 9 and is located directly above the wedge-shaped pressure block 14.

[0035] When the suction cup 7 moves downward, the wedge-shaped pressing block 14 drives the mounting block 3 to move downward synchronously, the mounting block 3 drives the one end of the spring 13 to move downward synchronously, and the spring 13 is stretched; when the suction cup 7 moves downward to the top surface of the anchor (i.e., the position adjustment of the supporting plate 1 is completed), the pressing plate 9 drives the piston 8 to move downward relative to the suction cup 7, the pressing plate 9 drives the wedge-shaped push rod 15 to move downward synchronously, when the piston 8 moves downward to the lowest point, the wedge-shaped push rod 15 drives the wedge-shaped pressing block 14 to move outward through the wedge-shaped surface, the wedge-shaped pressing block 14 is out of position with the mounting block 3, then the mounting block 3 and the correction plate 2 can move upward to the initial position under the elastic force of the spring 13, which is convenient for the clamping piece to be pressed into the anchor hole after the subsequent steel strand tensioning is completed; through the setting of the driving unit 30, it can be ensured that the supporting plate 1 is completely fixed with the anchor, and then the mounting block 3 and the correction plate 2 can move upward to the initial position.

[0036] Specifically, as shown in Figure 5 , the rotating shaft of the correction plate 2 is fixedly connected with a limiting block 16, a limiting groove 17 is formed in the mounting block 3, and the limiting block 16 and the limiting groove 17 are in sliding fit; through the setting of the limiting block 16 and the limiting groove 17, the correction plate 2 can only rotate within a certain range, and when the correction plate 2 rotates counterclockwise to the maximum angle, the angle formed between the correction plate 2 and the supporting plate 1 is equal to the angle of the anchor hole.

[0037] Specifically, as shown in Figure 1 , the supporting plate 1 is rotatably connected with a support 29; a torsional spring II is sleeved on the rotating shaft of the support 29 for resetting of the support 29; a guide roller 5 is rotatably installed on the support 29, and the guide roller 5 is located above the positioning roller 4; since the positioning roller 4 needs to be relatively fixed with the supporting plate 1 to ensure that the steel strand below the positioning roller 4 is parallel to the anchor hole, the positioning roller 4 bears a large pressure during the tensioning process of the steel strand; through the setting of the support 29 and the guide roller 5, the guide roller 5 can bear most of the pressure during the tensioning process of the steel strand and release the pressure through the buffering action of the torsional spring II, and the positioning roller 4 can work more stably.

[0038] Specifically, as shown in Figure 2 , Figure 3 , Figure 6 and Figure 10 , the supporting plate 1 is slidably connected with a pressing rod 18 in the vertical direction, the pressing rod 18 is fixedly connected with a spring II 19, and the top end of the spring II 19 is fixedly connected with the supporting plate 1; the pressing rod 18 is fixedly connected with a steel wire 20, the steel wire 20 passes through the supporting plate 1 at the end away from the pressing rod 18 and is fixedly connected with a sliding block 22, and the sliding block 22 is slidably connected with the supporting plate 1 in the vertical direction; the sliding block 22 is provided with a draw hook 21 capable of driving the sliding block 22 to move downward, the draw hook 21 is rotatably connected with the pressing plate 9, a gear 23 is connected with the rotating shaft of the draw hook 21 through a one-way bearing; a rack 24 is fixedly connected with the top of the suction cup 7, and the rack 24 can be engaged with the gear 23.

[0039] When the pressing plate 9 moves downward, the slider 22 is driven to move downward by the hook 21, the slider 22 drives one end of the steel wire 20 to move downward, the other end of the steel wire 20 drives the pressing rod 18 to move upward, and the spring 19 is compressed during the upward movement of the pressing rod 18; when the pressing plate 9 moves downward relative to the suction plate 7, the gear 23 is driven to rotate by the rack 24, and the gear 23 does not act on the hook 21; when the tensioning of the steel wire is completed, the tensioning jack 28 does not release the steel wire, the electric telescopic cylinder 10 drives the pressing plate 9 to move upward, the pressing plate 9 drives the hook 21 and the gear 23 to move upward synchronously, at this time, the rack 24 drives the gear 23 and the hook 21 to rotate clockwise in the state shown in the figure, and after the hook 21 is rotated to be separated from the slider 22, the tension of the tension rod 18 is small, the tension rod 18 is quickly moved downward under the elastic force of the spring 19, the tension rod 18 can press the clamping piece into the anchor hole, then the tensioning jack 28 can release the steel wire, the suction plate 7 is not adsorbed to the anchor device, and the construction personnel can directly disassemble the correction mechanism, and the tensioning work of the steel wire can be more smoothly performed. Figure 6

[0040] Specifically, as shown in Figure 7 and Figure 8 , the connecting piece 25 includes a plurality of fixed sleeves 26 and a plurality of sliding rods 27, the number of the fixed sleeves 26 and the sliding rods 27 is the same as the number of the support plates 1, the fixed sleeves 26 are fixedly connected with the support plates 1, and the sliding rods 27 are movably connected with the fixed sleeves 26; as shown in Figure 7 , in the embodiment, the fixed sleeves 26 and the sliding rods 27 are all provided in three, two of the sliding rods 27 are movably connected with the fixed sleeves 26, and the other sliding rod 27 is an independent part and can be inserted with the fixed sleeves 26 on the two sides; as shown in Figure 8 , the three support plates 1 are in the abutting state in the initial state, and the right side forms a gap for avoiding the steel wire; after the steel wire is located inside the correction mechanism, the correction mechanisms on the two sides are moved outward, then the support plates 1 on the two sides are relatively fixed through the independent sliding rod 27, and at this time, the three correction mechanisms form an integral whole.

[0041] Specifically, as shown in Figure 3 , the support plate 1 is provided in an arc shape, the anchor holes on the anchor device are distributed in a regular polygon, the support plate 1 is provided in the arc shape, the support plate 1 can avoid shielding the anchor holes, and the contact area between the support plate 1 and the top of the anchor device is increased.

[0042] The elastic sliding connection (installation) in the above refers to a structure that can automatically reset after sliding, including a spring structure in the figure, but not limited to the spring structure.

[0043] ​It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0044] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the principles and spirits of the application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges, characterized in that: The application relates to a correction device for anchor clamps, which comprises a plurality of correction mechanisms arranged in a circumferential array, a plurality of the correction mechanisms are movably connected through connecting pieces, the correction mechanism comprises a support plate, a mounting block is slidably connected with the support plate in the vertical direction, a correction plate is rotatably connected with the mounting block, a torsional spring I is sleeved on the rotation shaft of the correction plate and is used for resetting the correction plate, a positioning roller is rotatably installed on the inner side of the support plate, a driving unit is arranged on the support plate and is used for driving the correction plate to insert into an anchor hole of an anchor clamp, thereby adjusting the position of the support plate, so that the positioning roller is tangent to a clamping piece hole of the anchor clamp, and a locking unit is movably installed on the support plate, the locking unit can relatively fix the support plate with the anchor clamp after the position of the support plate is adjusted and the correction is completed. The locking unit comprises a suction disc which is slidably connected with the support plate in the vertical direction, a piston which is slidably connected with the suction disc, a pressing plate which is fixedly installed on the top of the piston, an electric telescopic cylinder which is fixedly connected with the support plate at the fixed end and is fixedly connected with the pressing plate at the output end, and a switch valve which is arranged on the side wall of the suction disc and is used for controlling the piston to exhaust. The support plate is slidably connected with a pressing rod in the vertical direction, the pressing rod is fixedly connected with a spring II, the top end of the spring II is fixedly connected with the support plate, the pressing rod is fixedly connected with a steel rope, the steel rope passes through the support plate at the end far from the pressing rod and is fixedly connected with a sliding block, the sliding block is slidably connected with the support plate in the vertical direction, the side edge of the sliding block is provided with a drag hook which can drive the sliding block to move downwards, the drag hook is rotatably connected with the pressing plate, the rotation shaft of the drag hook is connected with a gear through a one-way bearing, and the top of the suction disc is fixedly connected with a rack which can mesh with the gear.

2. The parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges according to claim 1, characterized in that: The switch valve comprises a sealing block which is elastically slidably connected with the suction disc, and a top rod which is in an inclined shape, is hinged at the top end with the sealing block and is located below the suction disc.

3. The parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges according to claim 1, characterized in that: The driving unit comprises a spring I which is fixed with the mounting block and is used for resetting the mounting block, a wedge-shaped pressing block which is elastically slidably installed on the top of the suction disc and can drive the mounting block to move downwards along with the suction disc, and a wedge-shaped push rod which is fixedly connected with the pressing plate and is located directly above the wedge-shaped pressing block.

4. The parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges according to claim 1, characterized in that: The rotation shaft of the correction plate is fixedly connected with a limiting block, a limiting groove is formed in the mounting block, and the limiting block and the limiting groove are slidably matched.

5. The parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges according to claim 1, characterized in that: A support is rotatably connected with the support plate, a torsional spring II is sleeved on the rotation shaft of the support and is used for resetting the support, and a guide roller is rotatably installed on the support and is located above the positioning roller.

6. The parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges according to claim 1, characterized in that: The connecting pieces comprise a plurality of fixed sleeves and a plurality of sliding rods, the number of the fixed sleeves and the sliding rods is the same as the number of the support plates, the fixed sleeves are fixedly connected with the support plates, and the sliding rods are movably connected with the fixed sleeves.

7. The parallel steel wire cable-stayed tension and compression combined pulling device for cable-stayed bridges according to claim 1, characterized in that: The support plate is arranged in an arc shape.

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