A formwork erection device for bridge construction

Abstract

The present invention discloses a formwork erection device for bridge construction, which includes a main supporting suspension cable that can be freely wound on the crane boom, and a lifting plate for suspending a pier steel formwork sleeved on the outer circle of a pier reinforcement cage. The top of the pier reinforcement cage includes a top reinforcement joint area where stirrups are not provided. The lifting plate is provided with a closing structure to prevent the longitudinal stressed main reinforcement in the top reinforcement joint area from hindering the lowering of the pier steel formwork. The crane boom is provided with a circuit control component for adjusting the energization state of the electromagnet according to the hanging length of the main supporting suspension cable. Through the closing structure, the present invention can automatically adjust the opening at the top of the pier reinforcement cage to make its diameter meet the requirements of the formwork, thereby ensuring that the formwork can be smoothly and accurately lowered to the designated position, reducing the construction risks caused by non-matching of the reinforcement, and significantly improving the formwork erection speed by automatically adjusting the closing process of the top reinforcement, and further improving the construction efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of formwork erection devices, and specifically to a formwork erection device for bridge construction. Background Art

[0002] A crane is a mechanical device used for lifting and transporting heavy objects in space. In formwork erection, the crane plays a crucial role. It can not only lift and place heavy formworks but also ensure the precise positioning of the formworks during construction, which is particularly important for large or high-rise bridge construction. The crane can safely lift the formwork from the ground to the designated construction height and help workers accurately install the formwork in place. After the construction is completed, the formwork needs to be disassembled and moved to the next construction site, and the crane can effectively complete this process, reducing labor and time costs.

[0003] The existing Chinese patent with the patent number CN110396933B authorizes a formwork erection device and erection method for bridge construction, including a positioning cage and a guiding mechanism; the positioning cage is fixedly connected by vertical rods arranged vertically and two horizontal frames arranged horizontally, and the two horizontal frames are arranged parallel to each other in the length direction of the vertical rod. The guiding mechanism includes a frame detachably connected to the positioning cage, an AC motor fixed on the frame, and a hoisting drum coaxially connected to the output shaft of the AC motor; a nylon rope is wound around the hoisting drum, and a fixed pulley is provided on each side of the horizontal frame arranged at the lower part of the vertical rod. On the one hand, this erection device prevents the influence of wind on the hoisting of single steel formworks; on the other hand, it can enable the single steel formworks to quickly reach the positioning cage. Each time the nylon rope is wound or unwound, the installation of one steel formwork is completed, which is orderly, time-saving, and labor-saving. Moreover, in this solution, the single steel formwork falls along the guide rail under the action of its own weight and is positioned after falling, which is very practical.

[0004] When the formwork erection device in the above patent is used for the pouring construction of bridge piers on the shore or on the water surface, it is difficult to directly hoist the formed bridge pier steel formwork to the position of the bridge pier steel reinforcement cage. And in the existing bridge construction technology, some steel bars connected to its upper structure need to be set at the top of the bridge pier steel reinforcement cage. Therefore, the actual concrete pouring height of the bridge pier will be less than the height of the bridge pier steel reinforcement cage. And in order to more firmly tie the steel bars in the upper structure together at the top of the steel reinforcement cage, the stirrups are usually not welded at the top of the bridge pier steel bar cage during the construction of the bridge pier. Furthermore, the longitudinal stressed main steel bars at the top of the bridge pier steel reinforcement cage may have an open-mouth phenomenon, that is, the diameter of the top of the bridge pier steel reinforcement cage will be greater than the required standard diameter. Therefore, when hoisting the bridge pier steel formwork, it is difficult for the existing formwork erection device to avoid the obstacle problem caused by the steel bar tying phenomenon at the top of the bridge pier steel reinforcement cage during the positioning and lowering process of the bridge pier steel formwork. Therefore, a formwork erection device for bridge construction is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a formwork erection device for bridge construction, which has the advantages of ensuring that the formwork can be smoothly and accurately lowered to the designated position and reducing the construction risks caused by the non - cooperation of steel bars, and solves the problem that it is difficult to avoid the hindrance caused by the steel bar tie - in at the top of the pier steel reinforcement cage during the positioning and lowering process of the pier steel formwork.

[0006] To achieve the above object, the present invention provides the following technical solution: A formwork erection device for bridge construction includes a main supporting cable that can be freely retracted on the crane boom, and a lifting plate for hanging the pier steel formwork sleeved on the outer circle of the pier steel reinforcement cage. The pier steel reinforcement cage is composed of multiple groups of longitudinal stressed main steel bars and stirrups. The top of the pier steel reinforcement cage includes a top steel bar joint area where no stirrups are provided, and a closing - mouth structure for preventing the longitudinal stressed main steel bars at the top steel bar joint area from hindering the lowering of the pier steel formwork is provided on the lifting plate;

[0007] The closing - mouth structure includes an electromagnet arranged below the lifting plate. The electromagnet is fixedly connected to the lifting plate. Below the electromagnet, there is a co - magnetic iron block adsorbed by it. One end of the co - magnetic iron block away from the electromagnet is fixedly connected to a closing - mouth seat for tightening the longitudinal stressed main steel bars at the top steel bar joint area. A circuit control component for adjusting the energization state of the electromagnet according to the hanging length of the main supporting cable is provided on the crane boom;

[0008] One side of the closing - mouth seat facing the pier steel reinforcement cage includes an integrally formed inner inclined part, and the inner inclined part is inclined upward with the central axis of the closing - mouth seat as the center.

[0009] Preferably, one end of the main supporting cable facing the lifting plate is fixedly connected with a cable head. Below the cable head, there are multiple groups of branch cables, and both ends of the multiple groups of branch cables are respectively fixedly connected to the cable head and the lifting plate.

[0010] Preferably, multiple groups of equally - spaced hanging ear seats are fixedly connected to the outer peripheral surface of the pier steel formwork, and hooks adapted to the hanging ear seats are fixedly connected to the lower surface of the lifting plate.

[0011] Preferably, the closing - mouth seat further includes an integrally formed end ring part, and the end ring part is in sliding contact with the inner wall of the pier steel formwork, and one side of the end ring part facing the inner wall of the pier steel formwork is treated with an arc angle;

[0012] Below the end ring part, there are multiple groups of blocking spheres. The multiple groups of blocking spheres are equally - spaced on the outer peripheral surface of the closing - mouth seat, and a rolling ball cavity for the blocking spheres to slide is formed on the closing - mouth seat. The outer peripheral surface of the blocking sphere is in sliding contact with the inner wall of the pier steel formwork.

[0013] Preferably, a magnetic isolation rubber ring is sleeved outside the electromagnet, and the magnetic isolation rubber ring is fixedly connected to the lower surface of the lifting plate.

[0014] Preferably, the circuit control component includes a U-shaped positioning plate fixedly connected to the crane boom. A winding cylinder is provided on the U-shaped positioning plate. Both ends of the winding cylinder are rotatably fixed on the side plates integrally formed with the U-shaped positioning plate. The main supporting cable is wound on the winding cylinder.

[0015] A vertical support plate is fixedly connected to the U-shaped positioning plate. A notch power connection copper sheet electrically connected in series with the electromagnet is provided on the vertical support plate. A swing power connection copper sheet electrically connected in series with the electromagnet and freely rotatable in the vertical direction is also provided on the U-shaped positioning plate.

[0016] The opposite surfaces of the notch power connection copper sheet and the swing power connection copper sheet are in sliding contact.

[0017] Preferably, a sector gear is coaxially fixed on the winding cylinder. The sector gear meshes with a driven gear. The driven gear is rotatably fixed on the U-shaped positioning plate. A limiting component for restricting the arbitrary rotation of the driven gear is provided on the sector gear.

[0018] A positioning cylinder is fixedly connected to the driven gear. The positioning cylinder and the driven gear are coaxially fixed. A positioning column is provided on the positioning cylinder, and a positioning groove for the sliding connection of the positioning column is provided. A pressing spring is provided in the positioning groove. Both ends of the pressing spring are fixedly connected to the positioning column and the positioning cylinder respectively. The end of the positioning column away from the positioning cylinder is fixedly connected to the swing power connection copper sheet.

[0019] The notch power connection copper sheet includes an integrally formed notch portion. An inclined blocking plate is fixedly connected to one end of the notch power connection copper sheet facing the notch portion.

[0020] Preferably, the limiting component includes an incomplete limiting ring fixedly connected to the sector gear. Multiple groups of equally spaced limiting arc-shaped pieces are fixedly connected to the driven gear corresponding to the position of the incomplete limiting ring. The opposite surfaces of the limiting arc-shaped pieces and the incomplete limiting ring are both arc-shaped.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] Through the closing structure, the present invention can automatically adjust the opening at the top of the pier steel reinforcement cage to make its diameter meet the requirements of the template, thereby ensuring that the template can be smoothly and accurately lowered to the designated position, reducing the construction risks caused by the non-matching of steel bars, and significantly improving the template erection speed by automatically adjusting the closing process of the top steel bars, thereby improving the construction efficiency.

[0023] Through the circuit control component on the crane boom, the present invention automatically adjusts the energization state of the electromagnet, automatically adjusts according to the specific stages of hoisting to control the stable descent of the template and the tightening of the steel bars, and can use the adjustment of the length of the main supporting cable to change the swing length and angular velocity of the template to reduce the swing during hoisting and increase the construction stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a three-dimensional schematic diagram of the overall structure of the present invention;

[0025] Figure 2 This is a schematic diagram of the components where the hanging plate of the present invention is located;

[0026] Figure 3 This is a schematic diagram of the components where the closing seat of the present invention is located;

[0027] Figure 4 This is a schematic diagram of the components where the ear mount of the present invention is located;

[0028] Figure 5 This is a schematic diagram of the component where the notched electrical copper sheet of the present invention is located;

[0029] Figure 6 This is a schematic diagram of the components where the pressure spring of the present invention is located;

[0030] Figure 7 For the present invention Figure 3 Enlarged view of point A in the middle;

[0031] Figure 8 It is a schematic diagram of the structure of the top steel bar joint area in the pier steel bar cage of the present invention.

[0032] In the figure: 1. Pier reinforcement cage; 2. Top reinforcement joint area; 3. Pier steel formwork; 4. Lifting plate; 5. Wire bundle head; 6. Branch cable; 7. Main branch cable; 8. Hook; 9. Hanging ear seat; 10. Closing seat; 11. Inner oblique part; 12. End ring; 13. Electromagnet; 14. Isotropic iron block; 15. Magnetic isolation rubber ring; 16. Blocking ball; 17. Rolling ball cavity; 18. U-shaped positioning plate; 19. Rolling cylinder; 20. Fan-shaped gear; 21. Driven gear; 22. Incomplete limiting ring; 23. Limiting arc plate; 24. Notched electrical copper plate; 25. Swinging electrical copper plate; 26. Positioning cylinder; 27. Positioning column; 28. Compression spring; 29. ​​Oblique blocking plate; 30. Vertical support plate. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0034] See also Figures 1 to 8, the present invention provides a technical solution: a formwork erection device for bridge construction, including a main supporting cable 7 that can be freely wound on the crane boom, and a lifting plate 4 for hanging the bridge pier steel formwork 3 sleeved outside the bridge pier steel reinforcement cage 1. The bridge pier steel reinforcement cage 1 is composed of multiple groups of longitudinal stressed main steel bars and stirrups. The top of the bridge pier steel reinforcement cage 1 includes a top steel bar joint area 2 where no stirrups are provided. The lifting plate 4 is provided with a closing structure to prevent the longitudinal stressed main steel bars at the top steel bar joint area 2 from obstructing the lowering of the bridge pier steel formwork 3;

[0035] The closing structure includes an electromagnet 13 arranged below the lifting plate 4. The electromagnet 13 is fixedly connected to the lifting plate 4. Below the electromagnet 13, there is a co-located iron block 14 magnetically adsorbed to it. One end of the co-located iron block 14 away from the electromagnet 13 is fixedly connected to a closing seat 10 for tightening the longitudinal stressed main steel bars at the top steel bar joint area 2. The crane boom is provided with a circuit control component for adjusting the energization state of the electromagnet 13 according to the hanging length of the main supporting cable 7;

[0036] One side of the closing seat 10 facing the bridge pier steel reinforcement cage 1 includes an integrally formed inner inclined part 11, and the inner inclined part 11 is inclined upward with the central axis of the closing seat 10 as the center.

[0037] As Figures 1 - 3 shown, during the construction of the bridge pier in a bridge, it is necessary to bind the bridge pier steel reinforcement cage 1 at the designed bridge pier position. Among them, the bridge pier steel reinforcement cage 1 is composed of multiple groups of longitudinal stressed main steel bars and stirrups. And in order to ensure better connection and binding between the bridge pier steel reinforcement cage 1 and the steel bars in the upper structure, its top usually has a top steel bar joint area 2 where no stirrups are welded. For this reason, the longitudinal stressed main steel bars arranged in a ring at the top steel bar joint area 2 may have an open-mouth phenomenon, that is, the top diameter of the bridge pier steel reinforcement cage 1 will be larger than its required standard diameter.

[0038] Therefore, for this bridge construction technical requirement, when hoisting the bridge pier steel formwork 3, the bridge pier steel formwork 3 is hung on the lifting plate 4. Among them, by controlling the height of the crane boom and the length of the main supporting cable 7, the bridge pier steel formwork 3 is positioned directly above the bridge pier steel reinforcement cage 1. At this time, due to the swinging process of the crane boom, the bridge pier steel formwork 3 may swing during the process of following the boom movement. Therefore, after the bridge pier steel formwork 3 reaches above the bridge pier steel reinforcement cage 1, by controlling the position of the boom and the length of the main supporting cable 7, the bridge pier steel formwork 3 is gradually moved closer to the top position of the bridge pier steel reinforcement cage 1.

[0039] At the same time, as the main support cable 7 is gradually released, its own height gradually increases. In this process, according to the law of conservation of angular momentum, when the pier steel formwork 3 swings due to the movement of the boom, the swing length of the pier steel formwork 3 is increased by releasing the main support cable 7, that is, the moment of inertia of the pier steel formwork 3 is increased, and then its angular velocity is reduced, thereby achieving the purpose of reducing the swing amplitude of the pier steel formwork 3.

[0040] Among them, under the action of its own gravity, the pier steel formwork 3 gradually stabilizes and the swing amplitude gradually decreases. When the pier steel formwork 3 gradually approaches the top steel bar joint area 2 at the pier steel cage 1 and the distance between the two decreases, the electromagnet 13 is powered off, so that the electromagnet 13 no longer has the ability to absorb the isotope iron block 14, so that the isotope iron block 14 and the closing seat 10 slide down in the pier steel formwork 3 under the action of gravity until the closing seat 10 is mounted on the longitudinal force-bearing main reinforcement at the top steel bar joint area 2.

[0041] It should be noted that the side of the closing seat 10 facing the pier steel cage 1 includes an integrally formed inner inclined portion 11. Therefore, when the closing seat 10 contacts the longitudinal main force at the top steel bar joint area 2, the longitudinal main force is in contact with the inner inclined portion 11. At the same time, the inclination direction of the inner inclined portion 11 is toward the central axis of the closing seat 10 and is inclined upward. Therefore, when the closing seat 10 falls due to gravity, the longitudinal main force at the top steel bar joint area 2 is gathered by the closing seat 10's own gravity and the falling speed, thereby reducing the horizontal cross-sectional diameter formed by the longitudinal main force at this location.

[0042] Among them, when the closing seat 10 is sleeved on the longitudinal force-bearing main reinforcement in the top steel bar joint area 2, the closing seat 10 is not completely separated from the pier steel formwork 3. At the same time, by winding up the main support cable 7, its length is gradually reduced. However, by lowering the height of the crane boom, the lifted pier steel formwork 3 can still be slowly moved downward. Moreover, the closing seat 10 is always in the pier steel formwork 3. Therefore, during the lowering process of the pier steel formwork 3, the setting of the closing seat 10 can provide a guiding effect for its lowering process to avoid its position deviation during the lowering process.

[0043] At the same time, when the pier steel formwork 3 has not yet been lowered to the bottom, under the action of the circuit control component, the electromagnet 13 is already in a power-on state, so when the pier steel formwork 3 is at the final stage of lowering, its isotope iron block 14 is re-adsorbed on the electromagnet 13 under the magnetic attraction of the electromagnet 13, wherein the isotope iron block 14 is fixedly connected to the closing seat 10, therefore, after the pier steel formwork 3 is erected and detached from the lifting plate 4, the closing seat 10 can synchronously follow the lifting plate 4 away from the pier steel formwork 3, so as to facilitate subsequent repeated lifting work.

[0044] In one relatively preferred embodiment, a cable head 5 is fixedly connected to one end of the main supporting cable 7 facing the hoisting plate 4, and a plurality of groups of branch supporting cables 6 are arranged below the cable head 5. Both ends of the plurality of groups of branch supporting cables 6 are fixedly connected to the cable head 5 and the hoisting plate 4 respectively.

[0045] A plurality of groups of ear seats 9 arranged at equal intervals are fixedly connected to the outer peripheral surface of the pier steel formwork 3, and a hook 8 adapted to the ear seat 9 is fixedly connected to the lower surface of the hoisting plate 4.

[0046] As Figures 1 - 4 shown, when hoisting the pier steel formwork 3, the release length of the main supporting cable 7 is adjusted by a driving component for adjusting the main supporting cable 7 on the crane, such as a winch or other driving components, so as to change the hoisting height of the lower hoisting plate 4.

[0047] Meanwhile, a plurality of groups of hooks 8 arranged on the hoisting plate 4 are hooked on the ear seats 9 on the pier steel formwork 3. Among them, the hook 8 is fixedly connected to the hoisting plate 4 through a steel cable. Therefore, through the hook 8 and the ear seat 9, the hooked pier steel formwork 3 and the hoisting plate 4 can be lifted and lowered synchronously and move synchronously when being lifted.

[0048] Furthermore, the closing seat 10 further includes an integrally formed end ring portion 12. The end ring portion 12 is in sliding contact with the inner wall of the pier steel formwork 3, and the side of the end ring portion 12 facing the inner wall of the pier steel formwork 3 is processed with an arc angle.

[0049] A plurality of groups of blocking spheres 16 are arranged below the end ring portion 12. The plurality of groups of blocking spheres 16 are arranged at equal intervals on the outer peripheral surface of the closing seat 10, and a rolling ball cavity 17 for the blocking spheres 16 to slide is formed on the closing seat 10. The outer peripheral surface of the blocking spheres 16 is in sliding contact with the inner wall of the pier steel formwork 3.

[0050] A magnetic isolation rubber ring 15 is sleeved outside the electromagnet 13, and the magnetic isolation rubber ring 15 is fixedly connected to the lower surface of the hoisting plate 4.

[0051] As Figure 1 、 Figure 3 and Figure 7 shown, when the electromagnet 13 is in the energized state, part of the magnetism can be blocked through the magnetic isolation rubber ring 15. Among them, the magnetic isolation rubber ring 15 is located at the outer peripheral surface of the electromagnet 13. Therefore, it can be avoided that the energized electromagnet 13 adsorbs the pier steel formwork 3.

[0052] Meanwhile, when the electromagnet 13 is de-energized and loses its magnetism, the closing seat 10 provided at its bottom descends under the action of gravity. Among them, the closing seat 10 relies on its own gravity and the dynamic potential energy during the fall to squeeze the longitudinal stressed main bars in the top steel bar joint area 2 and make them move closer to each other. Therefore, by providing multiple groups of freely rolling blocking spheres 16 on the closing seat 10, the blocking spheres 16 are in sliding contact with the inside of the pier steel formwork 3, thereby reducing the friction force of the closing seat 10 during the falling process, and further preventing the closing seat 10 from getting stuck in the pier steel formwork 3, thus ensuring the smooth fall of the closing seat 10.

[0053] It should be noted that when the closing seat 10 is sleeved on the longitudinal stressed main bars in the top steel bar joint area 2, the end ring part 12 integrally formed on the closing seat 10 is still inside the pier steel formwork 3. The purpose is to ensure that during the subsequent lowering process of the pier steel formwork 3, the closing seat 10 can provide a guiding function for it and prevent the position of the pier steel formwork 3 from shifting during the lowering process.

[0054] Further, the circuit control component includes a U-shaped positioning plate 18 fixedly connected to the crane boom. A winding cylinder 19 is provided on the U-shaped positioning plate 18. Both ends of the winding cylinder 19 are rotatably fixed on the side plates integrally formed on the U-shaped positioning plate 18. The main supporting cable 7 is wound on the winding cylinder 19;

[0055] A vertical supporting plate 30 is fixedly connected to the U-shaped positioning plate 18. A notch power connection copper sheet 24 electrically connected in series with the electromagnet 13 is provided on the vertical supporting plate 30. A swing power connection copper sheet 25 electrically connected in series with the electromagnet 13 and freely rotatable in the vertical direction is also provided on the U-shaped positioning plate 18. The opposite surfaces of the notch power connection copper sheet 24 and the swing power connection copper sheet 25 are in sliding contact.

[0056] As Figure 1 、 Figure 2 、 Figure 5 and Figure 6 shown, when the main supporting cable 7 is wound by the driving component on the crane, it can synchronously drive the winding cylinder 19 to freely rotate in the vertical direction. Among them, a notch power connection copper sheet 24 is provided on the U-shaped positioning plate 18, and a swing power connection copper sheet 25 that can freely rotate is also provided on it. At the same time, both the swing power connection copper sheet 25 and the notch power connection copper sheet 24 are connected in series with the electromagnet 13 and the power supply structure that provides power for the electromagnet 13. Therefore, when the swing power connection copper sheet 25 and the notch power connection copper sheet 24 are in contact, the circuit where the electromagnet 13 is located is unobstructed. At this time, the electromagnet 13 is in the energized state.

[0057] It should be noted that when the pier steel formwork 3 is just hoisted above the pier steel reinforcement cage 1, at this time, the electromagnet 13 is in the energized state. By releasing the main supporting cable 7 to increase its external release length, while reducing the swinging amplitude of the pier steel formwork 3, the pier steel formwork 3 can be gradually close to the top steel bar joint area 2. When the pier steel formwork 3 is about to contact the top steel bar joint area 2, at this time, the swing-position connecting copper sheet 25 is separated from the notch connecting copper sheet 24, thereby driving the electromagnet 13 to be in the de-energized state. At this time, the electromagnet 13 no longer has the ability to adsorb the same-position iron block 14, so that the same-position iron block 14 and the closing seat 10 slide downwards in the pier steel formwork 3 under the action of gravity until the closing seat 10 is sleeved on the longitudinal stressed main steel bars at the top steel bar joint area 2.

[0058] Among them, when lowering the pier steel formwork 3, by reducing the length of the main supporting cable 7, the swing-position connecting copper sheet 25 is re-contacted with the notch connecting copper sheet 24, thereby making the electromagnet 13 in the energized state. After the pier steel formwork 3 is erected, the same-position iron block 14 can be re-adsorbed on the electromagnet 13 to ensure that the closing seat 10 can synchronously follow the lifting plate 4 away from the pier steel formwork 3.

[0059] Further, a sector gear 20 is coaxially fixed on the winding cylinder 19. The sector gear 20 meshes with a driven gear 21. The driven gear 21 rotates on the U-shaped positioning plate 18 around a fixed axis. A limiting component for restricting the arbitrary rotation of the driven gear 21 is provided on the sector gear 20;

[0060] A positioning cylinder 26 is fixedly connected to the driven gear 21. The positioning cylinder 26 and the driven gear 21 are coaxially fixed. A positioning column 27 is provided on the positioning cylinder 26, and a positioning groove for the sliding connection of the positioning column 27 is provided. A pressing spring 28 is arranged in the positioning groove. The two ends of the pressing spring 28 are respectively fixedly connected to the positioning column 27 and the positioning cylinder 26. One end of the positioning column 27 far from the positioning cylinder 26 is fixedly connected to the swing-position connecting copper sheet 25. The notch connecting copper sheet 24 includes an integrally formed notch portion, and an inclined blocking plate 29 is fixedly connected to one end of the notch connecting copper sheet 24 facing the notch portion.

[0061] The limiting component includes an incomplete limiting ring 22 fixedly connected to the sector gear 20. A plurality of groups of equally spaced limiting arc-shaped pieces 23 are fixedly connected to the driven gear 21 corresponding to the position of the incomplete limiting ring 22. The opposite surfaces of the limiting arc-shaped pieces 23 and the incomplete limiting ring 22 are both arc-shaped.

[0062] Such as Figure 1 、 Figure 5 and Figure 6As shown, when the main supporting cable 7 is wound up to drive the winding position cylinder 19 to rotate, the sector gear 20 can be driven to rotate synchronously by the winding position cylinder 19. Among them, the sector gear 20 meshes with the driven gear 21, and thus the driven gear 21 can be driven to rotate intermittently. The driven gear 21 is coaxially fixed with a positioning cylinder 26, and a positioning post 27 and a swing position power connection copper sheet 25 are provided on the positioning cylinder 26. Therefore, changing the rotation of the driven gear 21 changes the relative position between the swing position power connection copper sheet 25 and the notch power connection copper sheet 24.

[0063] Meanwhile, when the swing position power connection copper sheet 25 contacts the notch power connection copper sheet 24, the electromagnet 13 is in the energized state. As the main supporting cable 7 is gradually wound up, the swing position power connection copper sheet 25 corresponds to the notch part, and at this time the electromagnet 13 is in the de-energized state. Among them, by arranging a pressing spring 28 on the positioning cylinder 26 and using the elastic potential energy of the pressing spring 28, the swing position power connection copper sheet 25 can be driven to closely adhere to the notch power connection copper sheet 24.

[0064] At the same time, an inclined baffle 29 is fixedly connected to one end of the notch power connection copper sheet 24 facing the notch part. When the swing position power connection copper sheet 25 rotates from the notch part to the position of the notch power connection copper sheet 24, the swing position power connection copper sheet 25 is blocked by the inclined baffle 29, causing the pressing spring 28 to undergo a compressive deformation, so that the swing position power connection copper sheet 25 can smoothly contact the notch power connection copper sheet 24.

[0065] It should be noted that when the sector gear 20 does not mesh with the driven gear 21, the relative surfaces of the incomplete limit ring 22 and the limit arc-shaped piece 23 correspond to each other at this time. Thus, the incomplete limit ring 22 is used to prevent the limit arc-shaped piece 23 and the driven gear 21 from rotating arbitrarily, thereby ensuring that the position of the swing position power connection copper sheet 25 will not change arbitrarily.

[0066] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A formwork erection device for bridge construction, comprising a main support cable (7) which is arranged on a crane cantilever and can be freely reeled up, and a hanging plate (4) for hanging a pier steel formwork (3) which is sleeved on the outer ring of a pier steel cage (1), wherein the pier steel cage (1) is composed of a plurality of groups of longitudinal force-bearing main bars and stirrups, and is characterized in that: The top of the pier steel cage (1) includes a top steel bar joint area (2) where no stirrups are provided, and a closing structure is provided on the hoisting plate (4) to prevent the longitudinal force-bearing main reinforcement at the top steel bar joint area (2) from hindering the lowering of the pier steel formwork (3); The closing structure comprises an electromagnet (13) fixedly connected to the bottom of the hanging plate (4), and an isotropic iron block (14) adsorbed thereon is provided below the electromagnet (13); The end of the isotropic iron block (14) away from the electromagnet (13) is fixedly connected to a closing seat (10) for tightening the longitudinal main reinforcement at the top reinforcement joint area (2), and a circuit control component for adjusting the power-on state of the electromagnet (13) according to the hanging length of the main support cable (7) is provided on the crane boom; The side of the closing seat (10) facing the pier reinforcement cage (1) comprises an integrally formed inner inclined portion (11), the inner inclined portion (11) being arranged to be inclined upward with the central axis of the closing seat (10) as the center; The main branch cable (7) is fixedly connected to a cable head (5) at one end facing the lifting plate (4), and a plurality of groups of branch cables (6) are provided below the cable head (5), and the two ends of the plurality of groups of branch cables (6) are respectively fixedly connected to the cable head (5) and the lifting plate (4); The closing seat (10) further comprises an integrally formed end ring portion (12), the end ring portion (12) being in sliding contact with the inner wall of the pier steel formwork (3); When the closing seat (10) is sleeved on the longitudinal main reinforcement in the top reinforcement joint area (2), the end ring portion (12) is still located inside the pier steel formwork (3).

2. A bridge construction formwork erection device according to claim 1, characterized in that: The outer peripheral surface of the bridge pier steel formwork (3) is fixedly connected to a plurality of groups of equally spaced hanging ear seats (9), and the lower surface of the hanging plate (4) is fixedly connected to a hook (8) that matches the hanging ear seats (9); The side of the end ring portion (12) facing the inner wall of the pier steel formwork (3) is arc-shaped; A plurality of groups of blocking balls (16) are provided below the end ring portion (12), and the plurality of groups of blocking balls (16) are equidistantly arranged on the outer peripheral surface of the closing seat (10), and a rolling ball cavity (17) for sliding the blocking balls (16) is provided on the closing seat (10), and the outer peripheral surface of the blocking balls (16) is in sliding contact with the inner wall of the pier steel formwork (3); The outer ring of the electromagnet (13) is provided with a magnetic isolation rubber ring (15), and the magnetic isolation rubber ring (15) is fixedly connected to the lower surface of the hanging plate (4); The circuit control assembly comprises a U-shaped positioning plate (18) fixedly connected to the crane boom, a reeling drum (19) being provided on the U-shaped positioning plate (18), two ends of the reeling drum (19) respectively rotating on a fixed axis on a side plate integrally formed with the U-shaped positioning plate (18), and the main support cable (7) being reeled on the reeling drum (19); The U-shaped positioning plate (18) is fixedly connected to a vertical support plate (30), the vertical support plate (30) is provided with a notched electrical copper sheet (24) electrically connected in series with the electromagnet (13), and the U-shaped positioning plate (18) is also provided with a swing electrical copper sheet (25) electrically connected in series with the electromagnet (13) and freely rotatable in the vertical direction.

3. A bridge construction formwork erection device according to claim 2, characterized in that: The opposing surfaces of the notched electrical copper sheet (24) and the positioned electrical copper sheet (25) are in sliding contact.

4. A bridge construction formwork erection device according to claim 3, characterized in that: A sector gear (20) is coaxially fixed on the reel drum (19), and the sector gear (20) is meshed with a driven gear (21).

5. A formwork erection device for bridge construction according to claim 4, characterized in that: The driven gear (21) is fixedly axially rotated on the U-shaped positioning plate (18), and a limiting component for limiting the arbitrary rotation of the driven gear (21) is provided on the sector gear (20).

6. A bridge construction formwork erection device according to claim 5, characterized in that: The driven gear (21) is fixedly connected with a positioning cylinder (26), the positioning cylinder (26) and the driven gear (21) are coaxially fixed, a positioning column (27) is provided on the positioning cylinder (26), and a positioning groove for sliding connection of the positioning column (27) is provided, a pressure spring (28) is provided in the positioning groove, two ends of the pressure spring (28) are respectively fixedly connected to the positioning column (27) and the positioning cylinder (26), and one end of the positioning column (27) away from the positioning cylinder (26) is fixedly connected to the positioning copper sheet (25); The notched electrical copper sheet (24) comprises an integrally formed notched portion, and an oblique blocking plate (29) is fixedly connected to one end of the notched electrical copper sheet (24) facing the notched portion.

7. A bridge construction formwork erection device according to claim 6, characterized in that: The limiting assembly comprises an incomplete limiting ring (22) fixedly connected to the sector gear (20), and a plurality of groups of equally spaced limiting arc pieces (23) are fixedly connected to the position of the driven gear (21) corresponding to the incomplete limiting ring (22), and the opposing surfaces of the limiting arc pieces (23) and the incomplete limiting ring (22) are both arranged in an arc shape.

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