A safety construction platform for lifting and lowering cap beams

Abstract

This invention relates to the field of bridge pier construction technology and discloses a safe construction platform for lifting bridge piers. The platform includes two bottom steel frames, one end of which is fixed with a first hydraulic cylinder. The output shaft of the first hydraulic cylinder is fixed to a top steel frame. The top of the two bottom steel frames has an installation groove, and a second hydraulic cylinder is fixed inside each bottom steel frame. The output shaft of the second hydraulic cylinder is fixed to the top steel frame. A third hydraulic cylinder is fixed inside both the bottom and top steel frames, and the output shaft of the third hydraulic cylinder is fixed to a support plate. This safe construction platform for lifting bridge piers utilizes a steel belt added to a double-layer limiting frame, and a fourth hydraulic cylinder pushes an auxiliary wheel assembly to compress the steel belt, forming a clamp on the bridge pier surface. As the two bottom and two top steel frames climb alternately, they wrap around the bridge pier, thereby increasing the frictional force during climbing and improving the stability of the platform during climbing.

Description

Technical Field

[0001] This invention relates to the field of bridge pier construction technology, specifically to a safe construction platform for lifting and lowering bridge piers. Background Technology

[0002] In bridge design and construction, the construction of cap beams is of paramount importance. During the construction of cap beams, a safe construction platform is usually erected next to the pier. The cap beams are then built on the construction platform, and finally the bridge is laid. In the existing technology, the methods used for cap beam construction include the ground support method, the clamp method, and the transverse steel bar method. In the existing technology, when using the clamp method for cap beam construction, bolts are usually used to connect and fix the clamps, so that the clamps are fitted on the surface of the pier. The static friction between the pier and the clamps is used to fix the clamps. An extended construction platform is built on the clamps, and finally the cap beams are built on the construction platform. However, in the existing technology, the clamping process usually requires a crane to lift the clamping parts to a designated height, and then a lifting platform to carry workers to move around the clamping parts before fixing the clamps. Workers are required to participate in both the installation and subsequent removal of the clamps. Therefore, the safety of people needs to be improved when using the clamping method. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides a safe construction platform for lifting and lowering cap beams, which solves the problems mentioned in the background section.

[0004] The present invention provides the following technical solution: a safety construction platform for lifting a cap beam, comprising two bottom steel frames, a first hydraulic cylinder fixed at one end of each bottom steel frame, the output shaft of the first hydraulic cylinder fixed to a top steel frame, an installation groove provided on the top of each bottom steel frame, and a second hydraulic cylinder fixed inside each bottom steel frame, the output shaft of the second hydraulic cylinder being fixed to the top steel frame; The bottom steel frame and the top steel frame are internally fixed with a third hydraulic cylinder, the output shaft of the third hydraulic cylinder is fixed with a support plate, and the surface of the support plate is fixed with a clamping plate. Positioning frames are fixed to the surfaces of the bottom steel frame and the top steel frame. A fourth hydraulic cylinder is hinged inside the positioning frame. A connector is hinged to the output shaft of the fourth hydraulic cylinder. A mounting plate is fixed to one end of the connector. A top support plate is fixed to the surface of the mounting plate. A sliding groove is opened inside the mounting plate. An anti-deviation rod is fixed inside the sliding groove. A mounting frame is slidably connected inside the sliding groove. An auxiliary wheel assembly is fixed to the surface of the mounting frame. The bottom steel frame and the top steel frame are respectively provided with a bottom mounting port and a top mounting port at the end near the first oil cylinder. A bottom support frame is fixed to the surface of the bottom mounting port, and a top support frame is fixed to the surface of the top mounting port.

[0005] Preferably, the bottom of the bottom steel frame is fixed with a support leg, a limit tube is fixed at one end of the bottom steel frame near the first oil cylinder, and a limit rod is fixed at one end of the top steel frame near the first oil cylinder, with the limit rod and the limit tube being slidably connected.

[0006] Preferably, a fixing frame is fixed to one end of the two bottom steel frames and the two top steel frames away from the first oil cylinder, and a crossbar is fixed to the surface of the fixing frame, and a connecting screw is threaded to the surface of the two crossbars; The bottom steel frame and the top steel frame are each provided in twos. The two bottom steel frames are slidably connected to each other at one end, and the two top steel frames are slidably connected to each other at one end. The surface of the extension frame is provided with a positioning groove, and the positioning groove is slidably connected to a positioning pin. The surface of the positioning pin is fixed with a pull ring.

[0007] Preferably, the mounting plate is threaded with a locking screw, which passes through the mounting plate and abuts against the mounting bracket. The bottom steel frame and the top steel frame are threaded with positioning screws, and the connector is rotatably connected to the positioning screws.

[0008] Preferably, a first inner rod is fixed to the surface of the bottom support frame near the bottom steel frame, a first sleeve is fixed to the surface of the top support frame near the first inner rod, a first spring is fixed to the end of the first sleeve near the bottom support frame, one end of the first spring is fixed to the bottom support frame, and the first sleeve is slidably connected to the first inner rod.

[0009] Preferably, a second inner rod is fixed to the surface of the bottom support frame away from the bottom steel frame, a second sleeve is fixed to the surface of the top support frame near the second inner rod, a second spring is fixed to the end of the second sleeve near the bottom support frame, one end of the second spring is fixed to the bottom support frame, and the second sleeve is slidably connected to the second inner rod.

[0010] Preferably, a double-layer limiting frame is fixed to the surface of the bottom mounting port, and a steel strip is fixed inside the double-layer limiting frame by bolts, with limiting openings at both ends of the steel strip.

[0011] Preferably, the surfaces of the two steel strips are slidably connected by a reinforcing hoop, an arc-shaped rod is fixed to one side of the reinforcing hoop, a threaded tube is fixed to the side of the reinforcing hoop near the arc-shaped rod, and a locking screw is threaded inside the threaded tube, the locking screw passes through the reinforcing hoop and abuts against the steel strip; Two steel strips are hinged to each other on opposite sides of the reinforcing hoops. A linkage plate is hinged to each other at opposite ends of the two hinge plates. An extrusion plate is fixed to the surface of the linkage plate near the arc-shaped rod.

[0012] Preferably, a vertical plate is fixed to the surface of the reinforcing hoop near the hinge plate, and a top rod is fixed to the side of the vertical plate near the hinge plate.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The safety construction platform for lifting bridge piers uses a steel belt added to a double-layer limit frame and a fourth hydraulic cylinder to push the auxiliary wheel assembly to squeeze the steel belt, forming a clamp on the surface of the pier. When the two bottom steel frames and the two top steel frames are raised alternately, the pier is wrapped, thereby increasing the friction of clamping during the raising process and thus improving the stability of the invention during the raising process.

[0014] 2. This safety construction platform for lifting bridge piers, through the addition of reinforcing hoops and hinged plates to the surface of the steel belt, allows the bottom steel frames and top steel frames on the same side to move closer together under the action of the first hydraulic cylinder when they are climbing in an alternating manner. This causes the bottom support frames and top steel frames on the same side to move closer together, which in turn causes the double-layer limiting frames and steel belts to move closer together. This, in turn, causes the steel belts to move the reinforcing hoops and hinged plates closer together, ultimately forming a compression and pushing the linkage plate towards the pier, thus subjecting the pier to secondary compression. This improves the stability of the lifting mechanism of this invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is an internal view of the structure of the present invention; Figure 3 This is a side view of the structure of the present invention; Figure 4 This is a schematic diagram of the positioning pin of the present invention; Figure 5 This is a schematic diagram of the connector and positioning screw of the present invention; Figure 6 This is a schematic diagram of the bottom support frame, top support frame, and double-layer limiting frame of the present invention; Figure 7 This is a schematic diagram of the steel strip structure of the present invention; Figure 8 This is a schematic diagram of the reinforcing hoop of the present invention.

[0016] In the diagram: 1. Bottom steel frame; 11. Support leg; 12. First hydraulic cylinder; 13. Top steel frame; 14. Limiting tube; 15. Limiting rod; 2. Mounting slot; 21. Second hydraulic cylinder; 22. Fixing frame; 23. Crossbar; 24. Connecting bolt; 25. Extension frame; 26. Positioning slot; 27. Positioning pin; 28. Pull ring; 3. Third hydraulic cylinder; 31. Support plate; 32. Clamping plate; 4. Positioning frame; 41. Fourth hydraulic cylinder; 42. Connecting piece; 43. Mounting plate; 431. Locking screw; 44. Top support plate; 45. Sliding groove; 46. Anti-deviation rod; 47. Mounting bracket; 48. Auxiliary wheel assembly; 49. Positioning screw; 5. Bottom mounting port; 501. Top mounting port; 51. Bottom support frame; 52. Top support frame; 53. First inner rod; 54. First sleeve; 55. First spring; 56. Second inner rod; 57. Second sleeve; 58. Second spring; 6. Double-layer limiting frame; 61. Steel strip; 62. Limiting port; 7. Reinforcing hoop; 71. Arc rod; 72. Threaded tube; 73. Locking screw; 74. Hinge plate; 75. Linkage plate; 76. Extrusion plate; 8. Vertical plate; 81. Top rod. Detailed Implementation

[0017] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] Example 1: Please refer to Figure 1-8 A safety construction platform for lifting a cap beam includes two bottom steel frames 1. A first hydraulic cylinder 12 is fixed to one end of each bottom steel frame 1. The output shaft of the first hydraulic cylinder 12 is fixed to a top steel frame 13. An installation groove 2 is provided on the top of each bottom steel frame 1. A second hydraulic cylinder 21 is fixed inside each bottom steel frame 1. The output shaft of the second hydraulic cylinder 21 is fixed to the top steel frame 13. A third hydraulic cylinder 3 is fixed inside the bottom steel frame 1 and the top steel frame 13. A support plate 31 is fixed to the output shaft of the third hydraulic cylinder 3. A clamping plate 32 is fixed to the surface of the support plate 31. Positioning frames 4 are fixed to the surfaces of the bottom steel frame 1 and the top steel frame 13. A fourth hydraulic cylinder 41 is hinged inside the positioning frame 4. A connector 42 is hinged to the output shaft of the fourth hydraulic cylinder 41. A mounting plate 43 is fixed to one end of the connector 42. A top support plate 44 is fixed to the surface of the mounting plate 43. A sliding groove 45 is opened inside the mounting plate 43. An anti-deviation rod 46 is fixed inside the sliding groove 45. A mounting frame 47 is slidably connected inside the sliding groove 45. An auxiliary wheel assembly 48 is fixed to the surface of the mounting frame 47. A bottom mounting port 5 and a top mounting port 501 are opened at the ends of the bottom steel frame 1 and the top steel frame 13 near the first hydraulic cylinder 12, respectively. A bottom support frame 51 is fixed to the surface of the bottom mounting port 5, and a top support frame 52 is fixed to the surface of the top mounting port 501. The bottom of the bottom steel frame 1 is fixed with a support leg 11. The end of the bottom steel frame 1 near the first oil cylinder 12 is fixed with a limit tube 14. The end of the top steel frame 13 near the first oil cylinder 12 is fixed with a limit rod 15. The limit rod 15 is slidably connected to the limit tube 14. The ends of the two bottom steel frames 1 and the two top steel frames 13 away from the first oil cylinder 12 are fixed with a fixing frame 22. The surface of the fixing frame 22 is fixed with a crossbar 23. The surfaces of the two crossbars 23 are threaded with connecting screws 24. Two bottom steel frames 1 and two top steel frames 13 are provided. The two bottom steel frames 1 are slidably connected to each other at one end. The two top steel frames 13 are slidably connected to each other at one end. The extension frame 25 is provided on the surface of the extension frame 25. The positioning pin 27 is slidably connected inside the positioning groove 26. The positioning pin 27 is fixed with a pull ring 28. The mounting plate 43 is threadedly connected to the surface of the mounting plate 43. The locking screw 431 passes through the mounting plate 43 and abuts against the mounting frame 47. The bottom steel frame 1 and the top steel frame 13 are threadedly connected to the surface of the positioning screw 49. The connecting piece 42 is rotatably connected to the positioning screw 49. Specifically, in actual operation, firstly, the two bottom steel frames 1 and the two top steel frames 13 are moved to the pier. Then, the two extension frames 25 are respectively fitted inside the two bottom steel frames 1 and the two top steel frames 13. Next, the positioning pins 27 are passed through the bottom steel frames 1 and the positioning grooves 26. Then, screws are inserted into the top and bottom of the surface of the positioning pins 27 and locked, thereby connecting the bottom steel frames 1 and the extension frames 25. Then, the positioning pins 27 are passed through the top steel frames 13 and the positioning grooves 26. Then, screws are inserted into the top and bottom of the surface of the positioning pins 27, thereby connecting the top steel frames 13 and the extension frames 25. Subsequently, the assembled bottom steel frame 1 and top steel frame 13 are fitted onto the surface of the pier. Then, the controller activates the third hydraulic cylinder 3 inside the two bottom steel frames 1, causing the third hydraulic cylinder 3 to push the support plate 31 and clamping plate 32 toward the surface of the pier. When the third hydraulic cylinder 3 is activated, the clamping plate 32 supports the pier, and the reaction force of the support is transmitted to the two bottom steel frames 1. Since the bottom steel frame 1 and top steel frame 13 are fitted onto the surface of the pier, the bottom steel frame 1 and top steel frame 13 cannot move in a straight line in the horizontal direction. Therefore, the clamping plate 32 is driven by the third hydraulic cylinder 3 to clamp the pier. Next, the controller starts the first hydraulic cylinder 12, which pushes the top steel frame 13, causing it to rise along the vertical direction of the first hydraulic cylinder 12, that is, the top steel frame 13 rises along the vertical direction of the pier. When the top steel frame 13 stops rising, the controller starts the third hydraulic cylinder 3 inside the top steel frame 13, which pushes the support plate 31 and the clamping plate 32 toward the pier until the clamping plate 32 abuts against the pier. Since the top steel frame 13 has the same function as the bottom steel frame 1, the third hydraulic cylinder 3 inside the top steel frame 13 can also drive the clamping plate 32 to clamp the pier after it is started. After the two bottom steel frames 1 and the two top steel frames 13 have clamped the pier, the controller controls the third cylinder 3 in the bottom steel frame 1 to return, so that the third cylinder 3 in the bottom steel frame 1 drives the support plate 31 and clamping plate 32 on its output shaft to return. At this time, only the clamping plate 32 in the top steel frame 13 clamps the pier. Then the controller controls the first cylinder 12 to return, and through the return of the first cylinder 12, the bottom steel frame 1 is pulled towards the top steel frame 13, thereby shortening the distance between the bottom steel frame 1 and the top steel frame 13. Then, the above steps are repeated, that is, the third oil cylinder 3 in the bottom steel frame 1 and the top steel frame 13 is repeatedly pushed out and returned to achieve the clamping of the pier. By alternately clamping the pier and repeatedly pushing out and returning the first oil cylinder 12, the two bottom steel frames 1 and the two top steel frames 13 are gradually raised during the clamping of the pier until the invention reaches the designated position and acts as a construction platform, so that the subsequent cap beam can be built. Furthermore, when the present invention is climbing on the surface of the bridge pier, the fourth hydraulic cylinder 41 can be activated by the controller, so that the fourth hydraulic cylinder 41 pushes the connecting member 42, so that the connecting member 42 is turned to the bridge pier under the limit of the positioning screw 49, and then the connecting member 42 drives the mounting plate 43, the mounting frame 47 and the auxiliary wheel assembly 48 to turn to the bridge pier. Then the auxiliary wheel assembly 48 can assist in clamping the bridge pier, thereby improving the climbing stability of the present invention.

[0019] It should be noted that the platform of the present invention actually has two layers. The two bottom steel frames 1 with extension frames 25 serve as the first layer platform, and the two top steel frames 13 with extension frames 25 serve as the second layer platform. When the two layers of platforms are raised in an alternating manner under the action of the third hydraulic cylinder 3, the limiting rod 15 slides inside the limiting tube 14. Thus, the limiting tube 14 and the limiting rod 15 can be used to control the bottom steel frame 1 and the top steel frame 13 on the same side to prevent deviation. This reduces the probability of the third hydraulic cylinder 3 changing its ejection distance in the bottom steel frame 1 and the top steel frame 13 on the same side, thereby improving the accuracy of each third hydraulic cylinder 3 ejecting and clamping the pier, and thus improving the stability of the climbing. Similarly, the connecting screw tubes 24 are threaded onto the surfaces of the two crossbars 23 respectively, further preventing the two platforms from deviating and improving the stability of the two platforms on the pier surface, as well as improving the climbing stability of the present invention. According to the instruction manual appendix Figure 4 It can be seen that the top and bottom of the positioning pin 27 are fitted with screws, so the two bottom steel frames 1 and the extension frame 25 can be connected and fixed by the positioning pin 27. At the same time, the two top steel frames 13 and the extension frame 25 can be connected and fixed by the positioning pin 27. Furthermore, users can choose to install rangefinders and levels on the top of the two top-level steel frames 13 to observe the horizontal angle of the invention's ascent and the distance of the invention from the ground and from the bridge pier, thereby improving the accuracy of subsequent cap beam construction. Example 2: A first inner rod 53 is fixed to the surface of the bottom support frame 51 near the bottom steel frame 1. A first sleeve 54 is fixed to the surface of the top support frame 52 near the first inner rod 53. A first spring 55 is fixed to the end of the first sleeve 54 near the bottom support frame 51. One end of the first spring 55 is fixed to the bottom support frame 51. The first sleeve 54 is slidably connected to the first inner rod 53. A second inner rod 56 is fixed to the surface of the bottom support frame 51 away from the bottom steel frame 1. A second sleeve 57 is fixed to the surface of the top support frame 52 near the second inner rod 56. A second spring 58 is fixed to the end of the second sleeve 57 near the bottom support frame 51. One end of the second spring 58 is fixed to the bottom support frame 51. The second sleeve 57 is slidably connected to the second inner rod 56. A double-layer limiting frame 6 is fixed to the surface of the bottom mounting port 5. A steel strip 61 is fixed inside the double-layer limiting frame 6 by bolts. Limiting ports 62 are opened at both ends of the steel strip 61. Specifically, based on Embodiment 1, before being fitted onto the bridge pier, the bottom support frame 51 and the top support frame 52 can be respectively snapped onto the bottom mounting port 5 and the top mounting port 501. Then, the steel strip 61 is fitted onto the inside of the double-layer limiting frame 6. Then, bolts are screwed into the surface of the double-layer limiting frame 6 and inserted into the limiting port 62, thereby fixing the steel strip 61 inside the double-layer limiting frame 6. Then, according to the steps of Embodiment 1, two bottom steel frames 1 and two top steel frames 13 are fitted onto the surface of the pier, and the third hydraulic cylinder 3 is started, so that the third hydraulic cylinder 3 drives the support plate 31 and the clamping plate 32 to move toward the pier, so that the clamping plate 32 abuts against the steel strip 61, and the clamping plate 32 pushes the steel strip 61 and clamps it again on the surface of the pier. Simultaneously, the controller activates the fourth hydraulic cylinder 41, which pushes the connecting piece 42. Under the limit of the positioning screw 49, the connecting piece 42 turns towards the pier, thereby causing the connecting piece 42 to drive the mounting plate 43 and the support plate 44 to turn towards the pier. During the rotation of the support plate 44, the support plate 44 contacts the steel strip 61, thereby causing the two ends of the steel strip 61 to be squeezed by the support plate 44 and move towards the pier. This causes the two ends of the steel strip 61 to gradually close on the surface of the pier until the steel strip 61 wraps around the pier, and then the steel strip 61 first completes the clamping operation on the pier. Since the contact area between the steel belt 61 and the pier is much larger than that between the clamp plate 32 and the pier, the stability of the invention during climbing can be further improved by the clamping of the steel belt 61. At the same time, when the two platforms are climbing alternately, the tension of the two steel belts 61 can be controlled by controlling the push-out and return of the fourth oil cylinder 41, thereby ensuring that only one steel belt 61 clamps the pier during the climbing process, thereby reducing the resistance between the invention and the pier during climbing and improving the climbing efficiency. Furthermore, the steel strip 61 also has the function of delaying the fall. After the steel strip 61 clamps the pier, it can increase the friction between the invention and the pier. When the invention falls accidentally, the fourth hydraulic cylinder 41 on the surface of the bottom steel frame 1 and the top steel frame 13 can be activated at the same time. This causes the fourth hydraulic cylinder 41 on the two platforms to push the mounting plate 43 and the top support plate 44 to squeeze the two ends of the two steel strips 61 at the same time, thereby tightening the two steel strips 61 synchronously. This further increases the friction between the invention and the pier, which not only slows down the fall speed of the invention, but also prevents the invention from overturning because the two steel strips 61 clamp the pier surface. This avoids objects falling from the two platforms, reduces the range of falling objects from height, and further reduces the risk of accidental fall. Meanwhile, when the invention is landed, shock absorption can be achieved through the first spring 55 and the second spring 58, the elastic force of the first inner rod 53 can be released through the first inner rod 53 and the first sleeve 54, and the elastic force of the second spring 58 can be released through the second inner rod 56 and the second sleeve 57, thereby reducing the vibration that occurs when the invention is landed, thus protecting people or equipment on the platform.

[0020] It should be noted that multiple limiting holes 62 are evenly provided at both ends of the steel strip 61. The length of the steel strip 61 in the bottom steel frame 1 and the top steel frame 13 can be adjusted by changing the spacing between the two ends of the steel strip 61 and the clamping inside the double-layer limiting frame 6. This ensures that the top support plate 44 can squeeze the steel strip 61 to form a clamp on the pier and provide sufficient friction to improve the stability of the climbing of the present invention.

[0021] Example 3: A reinforcing hoop 7 is slidably connected to the surfaces of two steel strips 61. An arc-shaped rod 71 is fixed to one side of the reinforcing hoop 7. A threaded tube 72 is fixed to the side of the reinforcing hoop 7 near the arc-shaped rod 71. A locking screw 73 is threaded inside the threaded tube 72. The locking screw 73 passes through the reinforcing hoop 7 and abuts against the steel strip 61. A hinge plate 74 is hinged to the opposite side of the reinforcing hoop 7 on the surfaces of the two steel strips 61. A linkage plate 75 is hinged to the opposite end of the two hinge plates 74. A pressing plate 76 is fixed to the surface of the linkage plate 75 near the arc-shaped rod 71. A vertical plate 8 is fixed to the surface of the reinforcing hoop 7 near the hinge plate 74. A top rod 81 is fixed to the side of the vertical plate 8 near the hinge plate 74. Specifically, based on Embodiment 1 and Embodiment 2, when the first and second platforms are climbing alternately, that is, when the first hydraulic cylinder 12 is returning, the two platforms will approach each other, which will cause the two steel belts 61 to approach each other. When the two steel belts 61 approach each other, the multiple reinforcing hoops 7 on the surface of the two steel belts 61 will also approach each other. When the two reinforcing hoops 7 approach each other, the two reinforcing hoops 7 will drive the hinge plates 74 on their surfaces to approach each other. Under the limitation of the upright plate 8 and the top rod 81, the two hinge plates 74 can only rotate towards the pier, which will cause the two hinge plates 74 to push the linkage plate 75 to move towards the pier until the linkage plate 75 drives the pressing plate 76 to press the pier, thereby clamping the pier again, thereby further improving the climbing stability of the present invention.

[0022] It should be noted that the reinforcing hoop 7 is movably fitted onto the surface of the steel strip 61. However, when the locking screw 73 is screwed into the inside of the threaded tube 72, the steel strip 61 can be squeezed by the locking screw 73, thereby fixing the reinforcing hoop 7 at the designated position on the surface of the steel strip 61. Among them, the arc-shaped rod 71, the threaded pipe 72, the hinge plate 74 and the extrusion plate 76 are all set on the side close to the pier, while the upright plate 8 and the top rod 81 are set on the side away from the pier. Thus, when the two steel strips 61 approach each other, they can drive the reinforcing hoop 7 and the hinge plate 74 to squeeze each other and flip towards the pier. When the two steel strips 61 move away from each other, they drive the reinforcing hoop 7 and the hinge plate 74 to return and stretch, so that the extrusion plate 76 releases contact with the pier.

[0023] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A safety construction platform for lifting and lowering a girder, comprising two bottom steel frames (1), characterized in that: Two bottom steel frames (1) are fixed with a first oil cylinder (12) at one end. The output shaft of the first oil cylinder (12) is fixed with a top steel frame (13). The top of the two bottom steel frames (1) is provided with an installation groove (2). A second oil cylinder (21) is fixed inside the two bottom steel frames (1). The output shaft of the second oil cylinder (21) is fixed with the top steel frame (13). The bottom steel frame (1) and the top steel frame (13) are fixed with a third oil cylinder (3), the output shaft of the third oil cylinder (3) is fixed with a support plate (31), and the surface of the support plate (31) is fixed with a clamping plate (32). Positioning frames (4) are fixed on the surfaces of the bottom steel frame (1) and the top steel frame (13). A fourth hydraulic cylinder (41) is hinged inside the positioning frame (4). A connector (42) is hinged to the output shaft of the fourth hydraulic cylinder (41). A mounting plate (43) is fixed at one end of the connector (42). A top support plate (44) is fixed on the surface of the mounting plate (43). A sliding groove (45) is provided inside the mounting plate (43). An anti-deviation rod (46) is fixed inside the sliding groove (45). A mounting frame (47) is slidably connected inside the sliding groove (45). An auxiliary wheel assembly (48) is fixed on the surface of the mounting frame (47). The bottom steel frame (1) and the top steel frame (13) are respectively provided with a bottom mounting port (5) and a top mounting port (501) at the end near the first oil cylinder (12). The bottom mounting port (5) is fixed with a bottom support frame (51), and the top mounting port (501) is fixed with a top support frame (52).

2. The safety construction platform for lifting and lowering the cap beam according to claim 1, characterized in that: The bottom of the bottom steel frame (1) is fixed with a support leg (11). A limit tube (14) is fixed at one end of the bottom steel frame (1) near the first oil cylinder (12). A limit rod (15) is fixed at one end of the top steel frame (13) near the first oil cylinder (12). The limit rod (15) is slidably connected to the limit tube (14).

3. The safety construction platform for lifting and lowering a girder according to claim 1, characterized in that: Two bottom steel frames (1) and two top steel frames (13) are fixed with a fixing frame (22) at the end away from the first oil cylinder (12). A crossbar (23) is fixed on the surface of the fixing frame (22), and a connecting screw pipe (24) is threaded onto the surface of the two crossbars (23). The bottom steel frame (1) and the top steel frame (13) are each provided in two. The two bottom steel frames (1) are slidably connected to each other at one end, and the two top steel frames (13) are slidably connected to each other at one end, and the extension frame (25) is provided on the surface of the extension frame (25). The positioning groove (26) is provided inside the positioning groove (26), and the positioning pin (27) is slidably connected inside the positioning groove (26). The surface of the positioning pin (27) is fixed with a pull ring (28).

4. The safety construction platform for lifting and lowering the cap beam according to claim 1, characterized in that: The mounting plate (43) is threaded with a locking screw (431), which passes through the mounting plate (43) and abuts against the mounting bracket (47). The bottom steel frame (1) and the top steel frame (13) are threaded with positioning screws (49), and the connector (42) is rotatably connected to the positioning screws (49).

5. The safety construction platform for lifting and lowering a girder according to claim 1, characterized in that: The bottom support frame (51) has a first inner rod (53) fixed on the surface near the bottom steel frame (1). The top support frame (52) has a first sleeve (54) fixed on the surface near the first inner rod (53). The first sleeve (54) has a first spring (55) fixed on the end near the bottom support frame (51). One end of the first spring (55) is fixed to the bottom support frame (51). The first sleeve (54) is slidably connected to the first inner rod (53).

6. The safety construction platform for lifting and lowering a girder according to claim 1, characterized in that: The bottom support frame (51) has a second inner rod (56) fixed on the surface away from the bottom steel frame (1). The top support frame (52) has a second sleeve (57) fixed on the surface near the second inner rod (56). The second sleeve (57) has a second spring (58) fixed on the end near the bottom support frame (51). One end of the second spring (58) is fixed to the bottom support frame (51). The second sleeve (57) is slidably connected to the second inner rod (56).

7. The safety construction platform for lifting and lowering a girder according to claim 1, characterized in that: A double-layer limiting frame (6) is fixed to the surface of the bottom mounting port (5). A steel strip (61) is fixed inside the double-layer limiting frame (6) by bolts. Limiting ports (62) are opened at both ends of the steel strip (61).

8. The safety construction platform for lifting and lowering a girder according to claim 7, characterized in that: Two steel strips (61) are slidably connected to a reinforcing hoop (7). An arc-shaped rod (71) is fixed to one side of the reinforcing hoop (7). A threaded tube (72) is fixed to the side of the reinforcing hoop (7) near the arc-shaped rod (71). A locking screw (73) is threaded inside the threaded tube (72). The locking screw (73) passes through the reinforcing hoop (7) and abuts against the steel strip (61). A hinge plate (74) is hinged to the opposite side of the reinforcing hoop (7) on the surface of the two steel strips (61), and a linkage plate (75) is hinged to the opposite end of the two hinge plates (74). A pressing plate (76) is fixed to the surface of the linkage plate (75) near the arc rod (71).

9. The safety construction platform for lifting and lowering a girder according to claim 8, characterized in that: A vertical plate (8) is fixed to the surface of the reinforcing hoop (7) near the hinge plate (74), and a top rod (81) is fixed to the side of the vertical plate (8) near the hinge plate (74).

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