Pushing support for steel box girder construction

Abstract

The invention relates to the technical field of bridge engineering, in particular to a pushing support for steel box girder construction, which comprises a supporting seat and a moving plate, the moving plate is connected with the supporting seat through a driving mechanism, a plurality of air pressure cylinders are fixed at the top of the moving plate, air pressure rods penetrate through the tops of the air pressure cylinders, and a top plate is fixed at the upper ends of the air pressure rods. The lower end of the air pressure rod extends into the air pressure cylinder and is in sliding connection with the inner wall of the air pressure cylinder, the air pressure cylinder is connected with an air pressure mechanism, the air pressure rod is connected with a self-locking mechanism, the air pressure mechanism is used for inflating the air pressure cylinder, so that the air pressure rod drives the top plate to move upwards, and the self-locking mechanism is used for fixing the air pressure rod; a plurality of groups of extrusion blocks are arranged between the supporting seat and the moving plate, and each group of extrusion blocks is connected with a rotating mechanism; according to the steel box girder pushing device, the purpose of pushing a steel box girder can be achieved only through rotation of the extrusion block, workers do not need to frequently operate a plurality of mechanisms, and the pushing efficiency of the steel box girder is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge engineering, and particularly to a jacking support for steel box girder construction. Background Technique

[0002] A steel box girder, also known as a steel plate box girder, is generally used in bridges with larger spans. It gets its name because its shape resembles a box. It mainly consists of components such as a top plate, a bottom plate, a web plate, a diaphragm plate, a longitudinal diaphragm plate, and stiffening ribs. These components are connected together by full welding to form a strong bridge structure. As a commonly used structural form for long-span bridges, the steel box girder has the advantages of simple structure, strong load-bearing capacity, good stability, etc., and has been widely applied and popularized in bridge engineering. Currently, the jacking construction process is often used during the laying of steel box girders.

[0003] In the prior art, most of them support the steel box girder through a temporary support mechanism. When the steel box girder needs to be jacked, first use a hydraulic mechanism to jack up the steel box girder from the temporary support mechanism, and then use a driving mechanism to drive the steel box girder to move forward a certain distance, thereby achieving the purpose of jacking.

[0004] However, this jacking method has certain defects. Most of the hydraulic mechanism and the driving mechanism are two independent mechanisms. When jacking the steel box girder, it requires workers to frequently operate the two mechanisms, resulting in a low jacking efficiency of the steel box girder. At the same time, the pressure exerted by the steel box girder on the hydraulic mechanism is relatively large, and the hydraulic mechanism is prone to slipping, having a certain safety hazard. Summary of the Invention

[0005] The purpose of the present invention is to provide a jacking support for steel box girder construction to solve the problems raised in the above background technique.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A jacking support for steel box girder construction includes a support base and a moving plate. The moving plate is connected to the support base through a driving mechanism. The driving mechanism is used to drive the moving plate to move horizontally. A plurality of air cylinders are fixed on the top of the moving plate. An air pressure rod penetrates through the top of the air cylinder. The upper end of the air pressure rod is fixed with a top plate. The lower end of the air pressure rod extends into the interior of the air cylinder and is slidably connected to the inner wall of the air cylinder. A first elastic member is fixed to the bottom of the top plate. The lower end of the first elastic member is fixedly connected to the top of the air cylinder. The air cylinder is connected to an air pressure mechanism, and the air pressure rod is connected to a self-locking mechanism. The air pressure mechanism is used to inflate the interior of the air cylinder, so that the air pressure rod drives the top plate to move upward. And when the top plate rises to the highest position, the self-locking mechanism is used to fix the air pressure rod. A plurality of groups of extrusion blocks are provided between the support base and the moving plate. Each group of extrusion blocks is connected to a rotating mechanism. The rotating mechanism is used to drive the extrusion blocks to rotate. And when the extrusion blocks rotate, the extrusion blocks drive the air pressure mechanism and the driving mechanism to operate successively.

[0007] Preferably: the pneumatic mechanism includes a fixing plate fixedly connected to the bottom of the support seat, an airbag is fixed on the side wall of the fixing plate, the airbag is connected to an air pipe, the end of the air pipe away from the airbag is connected to the air pressure cylinder, the fixing plate is connected to an extrusion assembly, when the extrusion block rotates, the extrusion assembly is used to squeeze the airbag, so that the gas inside the airbag enters the air pressure cylinder through the air pipe.

[0008] Preferably: the extrusion assembly includes a pressure plate arranged between the airbag and the extrusion block, the pressure plate is fixedly connected to a guide rod symmetrically distributed about the airbag, the guide rod passes through the fixed plate and is slidably connected to the fixed plate, and a second elastic member is provided on the outside of the guide rod, and both ends of the second elastic member are respectively fixedly connected to the fixed plate and the pressure plate.

[0009] Preferably: the rotating mechanism includes multiple groups of mounting plates fixed on the bottom of the support seat, and a rotating rod is rotatably connected between each group of mounting plates. The rotating rod passes through the extrusion block and is fixedly connected to the extrusion block. A motor is installed on one of the mounting plates, and the output end of the motor is fixedly connected to one end of the rotating rod. The rotating rods are connected by belts and pulleys.

[0010] Preferably: the self-locking mechanism includes a guide column fixed on the side wall of the pneumatic cylinder, a pin rod passing through the inside of the guide column, one end of the pin rod is fixed with a connecting block, a third elastic member is fixed on the side wall of the connecting block, the other end of the third elastic member is fixedly connected to the side wall of the guide column, the other end of the pin rod passes through the side wall of the pneumatic cylinder and is connected in abutment with the pneumatic rod, a pin groove matching the pin rod is provided on the side wall of the pneumatic rod, wherein the pin rod is connected to a traction assembly, and when the top plate completes pushing the steel box girder, the traction assembly is used to pull the pin rod to the outside of the pin groove.

[0011] Preferably: the traction assembly includes a guide cylinder that passes through the movable plate, the guide cylinder is fixedly connected to the movable plate, a sliding rod passes through the inside of the guide cylinder, the sliding rod is slidably connected to the guide cylinder, a wire groove passes through the inside of the guide cylinder, two ends of the wire groove respectively pass through the top of the guide cylinder and the side wall of the guide cylinder, a support plate is fixed to the top of the slide rod, a traction rope is fixed to the bottom of the support plate, the end of the traction rope away from the support plate passes through the inside of the wire groove and is fixedly connected to the connecting block, a fourth elastic member is provided on the outside of the slide rod, two ends of the fourth elastic member are respectively fixedly connected to the top of the guide cylinder and the bottom of the support plate, a first magnet is fixed to the bottom of the slide rod, and a second magnet that can repel the first magnet is fixed to the bottom of the support seat.

[0012] Preferably, the driving mechanism comprises a plurality of push plates fixed to the bottom of the movable plate, a plurality of fifth elastic members are fixed to the side walls of the movable plate, and one end of the fifth elastic member away from the movable plate is fixedly connected to the side wall of the support seat.

[0013] Preferably, extension plates are integrally formed at both ends of the moving plate. A sliding groove is provided inside the side wall of the support base. Two rotating rollers are rotatably connected inside the sliding groove. The extension plate passes between the two rotating rollers and is in rolling connection with the two rotating rollers.

[0014] Preferably, a plurality of buffer plates are provided above the moving plate. A plurality of limiting rods are fixed to the bottom of the buffer plate. The limiting rods penetrate through the moving plate and are in sliding connection with the moving plate. Sixth elastic members are provided outside the limiting rods. Two ends of the sixth elastic members are respectively fixed to the bottom of the buffer plate and the top of the moving plate.

[0015] Preferably, a plurality of grooves are provided inside each buffer plate. A roller is provided inside each groove. The top of the roller extends outside the groove. A rotating shaft penetrates through the roller. The rotating shaft is rotatably connected to the roller. The end of the rotating shaft is fixed to the inner wall of the groove.

[0016] Compared with the prior art, the beneficial effects of the present invention are as follows: When the present invention jacks up the steel box girder, the rotating rod drives the extrusion block to rotate. While the extrusion block rotates, it first squeezes the pressing plate. The pressing plate squeezes the airbag. After the airbag is squeezed, the gas inside it enters the air pressure cylinder through the air pipe, so that the air pressure inside the air pressure cylinder increases and squeezes the air pressure rod. Furthermore, the air pressure rod can jack up the steel box girder through the top plate. After the top plate jacks up the steel box girder, as the extrusion block continues to rotate, on the one hand, the extrusion block no longer squeezes the pressing plate, and on the other hand, it begins to squeeze the pushing plate. The pushing plate drives the moving plate to move forward a certain distance, thereby playing a role in jacking up the steel box girder. The purpose of jacking up the steel box girder can be achieved only by the rotation of the extrusion block, without the need for workers to frequently operate multiple mechanisms, effectively improving the jacking efficiency of the steel box girder; When the steel box girder is jacked up to the highest position, the pin rod inside the guide post is exactly aligned with the pin slot on the side wall of the air pressure rod. The end of the pin rod automatically enters the pin slot. The pin rod plays a fixing role on the air pressure rod through the pin slot, thereby restricting the downward movement of the air pressure rod, and further avoiding the sliding phenomenon of the air pressure rod caused by the large pressure of the steel box girder on the top plate, effectively ensuring the stability performance during the jacking process of the steel box girder; After the steel box girder moves forward a certain distance, the first magnet at the bottom of the sliding rod moves above the second magnet. Under the action of the repulsive force, the first magnet drives the support plate to move upward through the sliding rod. The support plate pulls the connecting block through the traction rope, so that the connecting block pulls out the pin rod from the pin slot, thereby releasing the fixing of the pin rod on the air pressure rod, enabling the top plate to drive the air pressure rod to move downward under the gravity of the steel box girder, and further playing a resetting role on the top plate and the air pressure rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the jacking support in the embodiment of the present invention.

[0018] Figure 2 This is a schematic diagram of the top structure of the moving plate in the embodiment of the present invention.

[0019] Figure 3 This is a schematic diagram of the connection structure between the extrusion block and the rotating rod in the embodiment of the present invention.

[0020] Figure 4 This is a schematic diagram of the connection structure between the pressing plate and the fixed plate in the embodiment of the present invention.

[0021] Figure 5 This is a schematic diagram of the internal structure of the air cylinder in the embodiment of the present invention.

[0022] Figure 6 This is a schematic diagram of the connection structure between the rotating roller and the support seat in the embodiment of the present invention.

[0023] Figure 7 This is a schematic diagram of the connection structure between the roller and the buffer plate in the embodiment of the present invention.

[0024] In the figure: 1 - steel box girder; 2 - temporary support mechanism; 3 - air pressure mechanism; 31 - air pipe; 32 - airbag; 33 - pressing plate; 34 - second elastic member; 35 - guide rod; 36 - fixed plate; 4 - rotating mechanism; 41 - rotating rod; 42 - pulley; 43 - belt; 44 - motor; 45 - mounting plate; 5 - self-locking mechanism; 51 - guide post; 52 - pin slot; 53 - pin rod; 54 - third elastic member; 55 - connecting block; 56 - towing rope; 57 - support plate; 58 - fourth elastic member; 59 - guide cylinder; 510 - sliding rod; 511 - first magnet; 512 - second magnet; 6 - driving mechanism; 61 - push plate; 62 - fifth elastic member; 63 - extension plate; 64 - rotating roller; 7 - support seat; 8 - moving plate; 9 - buffer plate; 10 - roller; 11 - sixth elastic member; 12 - limiting rod; 13 - air cylinder; 14 - air pressure rod; 15 - first elastic member; 16 - top plate; 17 - extrusion block. Detailed implementation manners

[0025] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0026] The following describes the specific implementation of the present invention in detail with reference to specific embodiments.

[0027] In one embodiment, please refer to Figure 1 , Figure 2 , Figure 3 and Figure 4, A jacking support for steel box girder construction, comprising a support base 7 and a moving plate 8. The moving plate 8 is connected to the support base 7 through a driving mechanism 6. The driving mechanism 6 is used to drive the moving plate 8 to move horizontally. A plurality of air cylinders 13 are fixed on the top of the moving plate 8. An air pressure rod 14 penetrates through the top of the air cylinder 13. The upper end of the air pressure rod 14 is fixed with a top plate 16. The lower end of the air pressure rod 14 extends into the interior of the air cylinder 13 and is slidably connected to the inner wall of the air cylinder 13. A first elastic member 15 is fixed to the bottom of the top plate 16. The lower end of the first elastic member 15 is fixedly connected to the top of the air cylinder 13. The air cylinder 13 is connected to an air pressure mechanism 3, and the air pressure rod 14 is connected to a self-locking mechanism 5. The air pressure mechanism 3 is used to inflate the interior of the air cylinder 13, so that the air pressure rod 14 drives the top plate 16 to move upward. And when the top plate 16 rises to the highest position, the self-locking mechanism 5 is used to fix the air pressure rod 14. A plurality of sets of extrusion blocks 17 are provided between the support base 7 and the moving plate 8. Each set of extrusion blocks 17 is connected to a rotating mechanism 4. The rotating mechanism 4 is used to drive the extrusion blocks 17 to rotate. And when the extrusion blocks 17 rotate, the extrusion blocks 17 drive the air pressure mechanism 3 and the driving mechanism 6 to operate successively.

[0028] In this embodiment, when the pushing support is in use, the support base 7 is placed under the steel box girder 1. When it is necessary to push the steel box girder 1, the rotating mechanism 4 drives the extrusion block 17 to rotate. While the extrusion block 17 rotates, the air pressure mechanism 3 first inflates the inside of the air pressure cylinder 13. The increased air pressure inside the air pressure cylinder 13 pushes the air pressure rod 14, and then the air pressure rod 14 drives the top plate 16 to move upward. The top plate 16 jacks up the steel box girder 1 from the temporary support mechanism 2. When the top plate 16 jacks up the steel box girder 1 to the highest position, the self-locking mechanism 5 automatically fixes the air pressure rod 14, thereby preventing the air pressure rod 14 from sliding down due to the large pressure of the steel box girder 1 on the top plate 16, effectively improving the stability of the air pressure rod 14, ensuring the jacking effect of the top plate 16 on the steel box girder 1, reducing potential safety hazards. When the extrusion block 17 continues to rotate to a certain position, the extrusion block 17 drives the moving plate 8 to move through the driving mechanism 6. The moving plate 8 drives the steel box girder 1 to move through the air pressure cylinder 13, the air pressure rod 14 and the top plate 16, so that the steel box girder 1 can move forward a certain distance. When the steel box girder 1 moves forward a certain distance, the self-locking mechanism 5 automatically releases the fixation of the air pressure rod 14. The top plate 16 drives the air pressure rod 14 to move downward under the action of the gravity of the steel box girder 1 until the steel box girder 1 falls on the top of the temporary support mechanism 2 again. At this time, as the extrusion block 17 continues to rotate, the driving mechanism 6 drives the moving plate 8 to automatically reset, and the moving plate 8 drives the air pressure cylinder 13, the air pressure rod 14 and the top plate 16 to automatically reset. In this way, the top plate 16 can continuously drive the steel box girder 1 to move forward a certain distance, and then achieve the purpose of pushing the steel box girder 1, with a relatively high pushing efficiency. The first elastic member 15 can be a spring, which can play a reset role for the top plate 16, that is, after the steel box girder 1 falls on the surface of the temporary support mechanism 2, the top plate 16 can continue to move downward under the action of the first elastic member 15, so that the top plate 16 is separated from the steel box girder 1, avoiding friction between the steel box girder 1 and the top plate 16, and when the driving mechanism 6 drives the moving plate 8 to reset, the top plate 16 will not drive the steel box girder 1 to move back.

[0029] Please refer to Figure 2 , Figure 4 and Figure 5 , the air pressure mechanism 3 includes a fixing plate 36 fixedly connected to the bottom of the support base 7. An airbag 32 is fixed on the side wall of the fixing plate 36. The airbag 32 is communicated with an air pipe 31. One end of the air pipe 31 away from the airbag 32 is communicated with the air pressure cylinder 13. The fixing plate 36 is connected with an extrusion assembly. When the extrusion block 17 rotates, the extrusion assembly is used to extrude the airbag 32, so that the gas inside the airbag 32 enters the inside of the air pressure cylinder 13 through the air pipe 31; When the steel box girder 1 is pushed, the extrusion block 17 is driven to rotate by the rotating mechanism 4. While the extrusion block 17 rotates, the airbag 32 is squeezed by the extrusion assembly. After the airbag 32 is squeezed, the gas inside it enters the air cylinder 13 through the air pipe 31, thereby increasing the air pressure inside the air cylinder 13 and squeezing the air rod 14, so that the air rod 14 can lift the steel box girder 1 through the top plate 16. When the extrusion assembly squeezes the airbag 32 to the maximum extent, the steel box girder 1 is lifted to the highest position. At this time, the self-locking mechanism 5 automatically fixes the air rod 14. As the extrusion block 17 continues to rotate, the extrusion assembly no longer squeezes the airbag 32, and after the self-locking mechanism 5 no longer fixes the air rod 14, the top plate 16 can drive the air rod 14 to move downward under the action of the gravity of the steel box girder 1, so that the gas inside the air cylinder 13 flows back to the airbag 32 through the air pipe 31.

[0030] See also Figure 4 The extrusion assembly includes a pressing plate 33 disposed between the airbag 32 and the extrusion block 17, the pressing plate 33 is fixedly connected to guide rods 35 symmetrically distributed about the airbag 32, the guide rods 35 penetrate the fixing plate 36 and are slidably connected to the fixing plate 36, and the guide rods 35 are provided with second elastic members 34 on the outside, and the two ends of the second elastic member 34 are fixedly connected to the fixing plate 36 and the pressing plate 33 respectively; When the steel box girder 1 is pushed, the extrusion block 17 is driven to rotate by the rotating mechanism 4. The extrusion block 17 rotates and squeezes the pressure plate 33. The pressure plate 33 squeezes the airbag 32, so that the gas inside the airbag 32 enters the air pressure cylinder 13 through the air pipe 31. When the extrusion block 17 no longer squeezes the pressure plate 33, the pressure plate 33 automatically resets under the action of the second elastic member 34. At this time, the pressure plate 33 no longer squeezes the airbag 32, wherein the second elastic member 34 can be a spring, and the fixed plate 36 can reset the pressure plate 33 through the guide rod 35, which effectively improves the stability of the pressure plate 33 when moving.

[0031] See also Figure 2 and Figure 3 The rotating mechanism 4 includes a plurality of mounting plates 45 fixed to the bottom of the support seat 7, and a rotating rod 41 is rotatably connected between each mounting plate 45, and the rotating rod 41 penetrates the extrusion block 17 and is fixedly connected to the extrusion block 17. A motor 44 is installed on one of the mounting plates 45, and the output end of the motor 44 is fixedly connected to one end of the rotating rod 41. The rotating rods 41 are connected through a belt 43 and a pulley 42. When jacking up the steel box girder 1, start the motor 44. The motor 44 drives one of the rotating rods 41 to rotate. While the rotating rod 41 rotates, it drives the other rotating rods 41 to rotate through the belt 43 and the belt pulley 42, so that the extrusion blocks 17 outside the rotating rods 41 can rotate synchronously, and then enables multiple pneumatic mechanisms 3 to operate synchronously, effectively ensuring the jacking effect of the steel box girder 1.

[0032] Please refer to Figure 5 As shown in the figure, the self-locking mechanism 5 includes a guide post 51 fixed on the side wall of the pneumatic cylinder 13. A pin rod 53 passes through the inside of the guide post 51. One end of the pin rod 53 is fixed with a connecting block 55. A third elastic member 54 is fixed on the side wall of the connecting block 55. The other end of the third elastic member 54 is fixedly connected to the side wall of the guide post 51. The other end of the pin rod 53 passes through the side wall of the pneumatic cylinder 13 and is in contact connection with the pneumatic rod 14. A pin slot 52 adapted to the pin rod 53 is provided on the side wall of the pneumatic rod 14. The pin rod 53 is connected with a traction assembly. When the top plate 16 finishes jacking up the steel box girder 1, the traction assembly is used to pull the pin rod 53 outside the pin slot 52. When jacking up the steel box girder 1, the rotating mechanism 4 drives the extrusion block 17 to rotate. While the extrusion block 17 rotates, it inflates the inside of the pneumatic cylinder 13 through the pneumatic mechanism 3. The air pressure inside the pneumatic cylinder 13 increases and pushes the pneumatic rod 14, so that the pneumatic rod 14 jacks up the steel box girder 1 from the temporary support mechanism 2 through the top plate 16. When the steel box girder 1 is jacked up to the highest position, the pin rod 53 inside the guide post 51 just aligns with the pin slot 52 on the side wall of the pneumatic rod 14. Under the action of the connecting block 55 and the third elastic member 54, the end of the pin rod 53 automatically enters the inside of the pin slot 52. The third elastic member 54 can be a spring. At this time, the pin rod 53 plays a fixing role on the pneumatic rod 14 through the pin slot 52, thus restricting the downward movement of the pneumatic rod 14, and further avoiding the sliding phenomenon of the pneumatic rod 14 caused by the large pressure of the steel box girder 1 on the top plate 16, effectively ensuring the stability performance during the jacking process of the steel box girder 1. After the top plate 16 jacks up the steel box girder 1, when the steel box girder 1 moves forward a certain distance, the traction assembly pulls the pin rod 53 outside the pin slot 52, thus releasing the fixation of the pin rod 53 on the pneumatic rod 14. Without the fixation of the pin rod 53, the top plate 16 automatically drives the pneumatic rod 14 to move downward under the gravity of the steel box girder 1. The top plate 16 and the pneumatic rod 14 automatically reset, and then when the driving mechanism 6 drives the moving plate 8 to reset, the top plate 16 will not drive the steel box girder 1 to move back.

[0033] Please refer to Figure 5, the traction assembly includes a guide cylinder 59 passing through the moving plate 8. The guide cylinder 59 is fixedly connected to the moving plate 8. A slide rod 510 passes through the inside of the guide cylinder 59. The slide rod 510 is slidably connected to the guide cylinder 59. A wire groove passes through the inside of the guide cylinder 59. The two ends of the wire groove respectively pass through the top of the guide cylinder 59 and the side wall of the guide cylinder 59. A support plate 57 is fixed to the top of the slide rod 510. A traction rope 56 is fixed to the bottom of the support plate 57. One end of the traction rope 56 away from the support plate 57 passes through the inside of the wire groove and is fixedly connected to the connection block 55. A fourth elastic member 58 is provided outside the slide rod 510. The two ends of the fourth elastic member 58 are respectively fixedly connected to the top of the guide cylinder 59 and the bottom of the support plate 57. A first magnet 511 is fixed to the bottom of the slide rod 510. A second magnet 512 capable of repelling the first magnet 511 is fixed to the bottom of the support seat 7; When the moving plate 8 moves, it also drives the guide cylinder 59 to move. The guide cylinder 59 drives the slide rod 510 to move synchronously. After the steel box girder 1 advances a certain distance, the first magnet 511 at the bottom of the slide rod 510 moves above the second magnet 512. The first magnet 511 and the second magnet 512 have the same magnetic polarity. Under the action of the repulsive force, the first magnet 511 drives the support plate 57 to move upward through the slide rod 510. Under the guidance of the wire groove, while the support plate 57 moves upward, it pulls the connection block 55 through the traction rope 56, so that the connection block 55 pulls out the pin rod 53 from the inside of the pin slot 52, thereby releasing the fixation of the pin rod 53 on the pneumatic rod 14, enabling the top plate 16 to drive the pneumatic rod 14 to move downward under the gravity of the steel box girder 1. After the steel box girder 1 is separated from the top plate 16, the driving mechanism 6 drives the moving plate 8 to reset. The moving plate 8 drives the slide rod 510 to reset through the guide cylinder 59, so that the first magnet 511 and the second magnet 512 no longer repel each other. At this time, the support plate 57 automatically moves downward under the action of the fourth elastic member 58. The fourth elastic member 58 can be a spring. The traction rope 56 is in a slack state and no longer pulls the connection block 55. Under the action of the connection block 55 and the third elastic member 54, the end of the pin rod 53 abuts against the side wall of the pneumatic rod 14 again. When the steel box girder 1 rises to the highest position, the pin rod 53 can enter the pin slot 52 on the side wall of the pneumatic rod 14 again, thereby fixing the pneumatic rod 14 again.

[0034] Please refer to Figure 2 , Figure 3 and Figure 4 , the driving mechanism 6 includes a plurality of push plates 61 fixed to the bottom of the moving plate 8. A plurality of fifth elastic members 62 are fixed to the side walls of the moving plate 8. One end of the fifth elastic member 62 away from the moving plate 8 is fixedly connected to the side wall of the support seat 7; When jacking the steel box girder 1, the rotation mechanism 4 drives the extrusion block 17 to rotate. While the extrusion block 17 rotates, the pneumatic mechanism 3 first inflates the inside of the pneumatic cylinder 13, so that the top plate 16 can jack up the steel box girder 1 from the top of the temporary support mechanism 2. After the top plate 16 jacks up the steel box girder 1 from the top of the temporary support mechanism 2, as the extrusion block 17 continues to rotate, the extrusion block 17 extrudes the push plate 61 at the bottom of the moving plate 8, so that the push plate 61 drives the moving plate 8 to move forward a certain distance, thereby playing a jacking role on the steel box girder 1. After the steel box girder 1 moves forward a certain distance, the self-locking mechanism 5 no longer fixes the pneumatic rod 14, and the steel box girder 1 falls on the top of the temporary support mechanism 2 again under the action of gravity. At the same time, the top plate 16 separates from the steel box girder 1 under the action of the first elastic member 15. At this time, as the extrusion block 17 continues to rotate, the extrusion degree of the extrusion block 17 on the push plate 61 decreases, and the moving plate 8 gradually resets under the action of the fifth elastic member 62, thereby driving the pneumatic cylinder 13, the pneumatic rod 14 and the top plate 16 to automatically reset. The fifth elastic member 62 can be a spring.

[0035] Please refer to Figure 2 and Figure 6 , both ends of the moving plate 8 are integrally formed with extension plates 63. Inside the side wall of the support seat 7, there is a chute, and two rotating rollers 64 are rotatably connected inside the chute. The extension plates 63 pass between the two rotating rollers 64 and are in rolling connection with the two rotating rollers 64; By limiting the extension plates 63 through the two rotating rollers 64, the stability performance of the moving plate 8 during movement can be effectively improved. And the setting of the rotating rollers 64 can reduce the friction between the extension plates 63 and the support seat 7, so that the moving plate 8 can smoothly reset under the action of the fifth elastic member 62. At the same time, it can also ensure the jacking effect on the steel box girder 1, so that the steel box girder 1 can smoothly move forward a certain distance.

[0036] Please refer to Figure 2 and Figure 7 , a plurality of buffer plates 9 are arranged above the moving plate 8. A plurality of limiting rods 12 are fixed to the bottom of the buffer plates 9. The limiting rods 12 penetrate through the moving plate 8 and are slidably connected with the moving plate 8. Sixth elastic members 11 are arranged outside the limiting rods 12, and both ends of the sixth elastic members 11 are respectively fixed to the bottom of the buffer plates 9 and the top of the moving plate 8; After the steel box girder 1 moves forward a certain distance, the self-locking mechanism 5 no longer fixes the pneumatic rod 14. Under the action of gravity, the steel box girder 1 will first land on the surface of the buffer plate 9 and then on the surface of the temporary support mechanism 2. After the buffer plate 9 is subjected to the pressure of the steel box girder 1, it will squeeze the sixth elastic member 11. The sixth elastic member 11 can play a buffering role on the steel box girder 1 through the buffer plate 9, thus effectively reducing the impact of the steel box girder 1 on the temporary support mechanism 2, improving the service life of the temporary support mechanism 2, and at the same time ensuring the stability of the steel box girder 1 during the falling process. The sixth elastic member 11 can be a spring, and the limiting rod 12 plays a limiting role on the buffer plate 9, effectively improving the stability of the buffer plate 9 during movement.

[0037] Please refer to Figure 7 A plurality of grooves are provided inside the buffer plate 9, and rollers 10 are provided inside the grooves. The tops of the rollers 10 extend outside the grooves. A rotating shaft penetrates through the rollers 10, and the rotating shaft is rotatably connected to the rollers 10. The end of the rotating shaft is fixedly connected to the inner wall of the groove. During the falling process of the steel box girder 1, it will directly land on the tops of the rollers 10, and the rollers 10 support the steel box girder 1. At this time, while the driving mechanism 6 drives the moving plate 8 to reset, it will also drive the buffer plate 9 to automatically reset. The rollers 10 inside the grooves will roll under the bottom of the steel box girder 1. Through the setting of the rollers 10, the friction between the steel box girder 1 and the buffer plate 9 can be effectively reduced, so that the moving plate 8 can be reset smoothly.

[0038] Working principle: When the jacking support is in use, the support base 7 is placed under the steel box girder 1. When it is necessary to jack the steel box girder 1, the motor 44 is started. The motor 44 drives one of the rotating rods 41 to rotate. While the rotating rod 41 rotates, it drives the other rotating rods 41 to rotate through the belt 43 and the pulley 42, so that the extrusion blocks 17 outside the rotating rods 41 can rotate synchronously. While the extrusion block 17 rotates, it first squeezes the pressing plate 33, and the pressing plate 33 squeezes the airbag 32. After the airbag 32 is squeezed, the gas inside it enters the air pressure cylinder 13 through the air pipe 31, so that the air pressure inside the air pressure cylinder 13 increases and squeezes the air pressure rod 14, and then the air pressure rod 14 can jack up the steel box girder 1 through the top plate 16. When the steel box girder 1 is jacked up to the highest position, the pin rod 53 inside the guide post 51 just aligns with the pin slot 52 on the side wall of the air pressure rod 14, and the end of the pin rod 53 automatically enters the pin slot 52. The pin rod 53 plays a fixing role on the air pressure rod 14 through the pin slot 52, so as to limit the downward movement of the air pressure rod 14, and then avoid the sliding phenomenon of the air pressure rod 14 caused by the large pressure of the steel box girder 1 on the top plate 16, effectively ensuring the stability performance during the jacking process of the steel box girder 1. After the top plate 16 jacks up the steel box girder 1, as the extrusion block 17 continues to rotate, the extrusion block 17 starts to squeeze the push plate 61, and the push plate 61 drives the moving plate 8 to move forward a certain distance, thus playing a jacking role on the steel box girder 1. After the steel box girder 1 moves forward a certain distance, the first magnet 511 at the bottom of the sliding rod 510 moves above the second magnet 512. The first magnet 511 and the second magnet 512 have the same magnetism. Under the action of the repulsive force, the first magnet 511 drives the support plate 57 to move upward through the sliding rod 510. Under the guidance of the wire groove, while the support plate 57 moves upward, it pulls the connecting block 55 through the traction rope 56, so that the connecting block 55 pulls out the pin rod 53 from the pin slot 52, thus releasing the fixation of the pin rod 53 on the air pressure rod 14, so that the top plate 16 can drive the air pressure rod 14 to move downward under the gravity of the steel box girder 1. After the steel box girder 1 is separated from the top plate 16, the moving plate 8 drives the sliding rod 510 to reset through the guide cylinder 59, so that the first magnet 511 and the second magnet 512 no longer repel each other. At this time, the support plate 57 automatically moves downward, the traction rope 56 is in a slack state, and no longer pulls the connecting block 55. The end of the pin rod 53 abuts against the side wall of the air pressure rod 14 again. In this way, the top plate 16 can continuously drive the steel box girder 1 to move forward a certain distance, so as to achieve the purpose of jacking the steel box girder 1, and the jacking efficiency is relatively high.

[0039] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A jacking support for steel box girder construction, comprising a support seat and a movable plate; characterized in that: The top end of the pneumatic cylinder is fixedly provided with a first elastic member, and the lower end of the pneumatic rod is extended into the interior of the pneumatic cylinder and is slidably connected with the inner wall of the pneumatic cylinder. The pneumatic cylinder is connected with a pneumatic mechanism, and the pneumatic rod is connected with a self-locking mechanism. The pneumatic mechanism is used to inflate the pneumatic cylinder, so that the pneumatic rod drives the top plate to move upward, and when the top plate rises to the highest position, the self-locking mechanism is used to fix the pneumatic rod. A plurality of extrusion blocks are arranged between the support seat and the movable plate, each group of extrusion blocks is connected with a rotating mechanism, the rotating mechanism is used to drive the extrusion blocks to rotate, and when the extrusion blocks rotate, the extrusion blocks successively drive the pneumatic mechanism and the driving mechanism to operate.

2. The jacking support for steel box girder construction according to claim 1, characterized in that: The pneumatic mechanism includes a fixing plate fixedly connected to the bottom of the support seat, an airbag is fixed on the side wall of the fixing plate, the airbag is connected to an air pipe, the end of the air pipe away from the airbag is connected to the air pressure cylinder, and the fixing plate is connected to an extrusion assembly. When the extrusion block rotates, the extrusion assembly is used to squeeze the airbag, so that the gas inside the airbag enters the air pressure cylinder through the air pipe.

3. The jacking support for steel box girder construction according to claim 2, characterized in that: The extrusion assembly includes a pressure plate arranged between the airbag and the extrusion block, the pressure plate is fixedly connected to a guide rod symmetrically distributed about the airbag, the guide rod passes through the fixed plate and is slidably connected to the fixed plate, and a second elastic member is provided on the outside of the guide rod, and both ends of the second elastic member are fixedly connected to the fixed plate and the pressure plate respectively.

4. The jacking support for steel box girder construction according to claim 1, characterized in that: The rotating mechanism includes multiple groups of mounting plates fixed on the bottom of the support seat, and a rotating rod is rotatably connected between each group of mounting plates. The rotating rod passes through the extrusion block and is fixedly connected to the extrusion block. A motor is installed on one of the mounting plates, and the output end of the motor is fixedly connected to one end of the rotating rod. The rotating rods are connected by belts and pulleys.

5. The jacking support for steel box girder construction according to claim 1, characterized in that: The self-locking mechanism includes a guide column fixed on the side wall of the pneumatic cylinder, a pin rod passing through the inside of the guide column, one end of the pin rod is fixed with a connecting block, a third elastic member is fixed on the side wall of the connecting block, the other end of the third elastic member is fixedly connected to the side wall of the guide column, the other end of the pin rod passes through the side wall of the pneumatic cylinder and is connected in abutment with the pneumatic rod, a pin groove matching the pin rod is provided on the side wall of the pneumatic rod, wherein the pin rod is connected to a traction assembly, and when the top plate completes pushing the steel box girder, the traction assembly is used to pull the pin rod to the outside of the pin groove.

6. The jacking support for steel box girder construction according to claim 5, characterized in that: The traction assembly includes a guide cylinder that passes through the movable plate, the guide cylinder is fixedly connected to the movable plate, a sliding rod passes through the inside of the guide cylinder, the sliding rod is slidably connected to the guide cylinder, a wire groove passes through the inside of the guide cylinder, two ends of the wire groove respectively pass through the top of the guide cylinder and the side wall of the guide cylinder, a support plate is fixed to the top of the slide rod, a traction rope is fixed to the bottom of the support plate, the end of the traction rope away from the support plate passes through the wire groove and is fixedly connected to the connecting block, a fourth elastic member is provided on the outside of the slide rod, and two ends of the fourth elastic member are respectively fixedly connected to the top of the guide cylinder and the bottom of the support plate, a first magnet is fixed to the bottom of the slide rod, and a second magnet that can repel the first magnet is fixed to the bottom of the support seat.

7. The jacking support for steel box girder construction according to claim 1, characterized in that: The driving mechanism comprises a plurality of push plates fixed on the bottom of the moving plate, a plurality of fifth elastic members are fixed on the side walls of the moving plate, and one end of the fifth elastic member away from the moving plate is fixedly connected to the side wall of the support seat.

8. The jacking support for steel box girder construction according to claim 7, characterized in that: Both ends of the movable plate are integrally formed with extension plates, a slide groove is provided inside the side wall of the support seat, two rotating rollers are rotatably connected inside the slide groove, and the extension plate passes between the two rotating rollers and is rollingly connected with the two rotating rollers.

9. The jacking support for steel box girder construction according to claim 1, characterized in that: A plurality of buffer plates are arranged above the movable plate, a plurality of limit rods are fixed at the bottom of the buffer plate, the limit rods penetrate the movable plate and are slidably connected with the movable plate, a sixth elastic member is arranged outside the limit rods, and both ends of the sixth elastic member are respectively fixedly connected with the bottom of the buffer plate and the top of the movable plate.

10. The jacking support for steel box girder construction according to claim 9, characterized in that: The buffer plate is provided with a plurality of grooves inside, each groove is provided with a roller, the top of the roller extends out of the groove, a rotating shaft runs through the roller, the rotating shaft is rotatably connected to the roller, and the end of the rotating shaft is fixedly connected to the inner wall of the groove.

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