Self-balanced gantry lifting system for four-point lifting and installation of floor steel beams

Abstract

The present invention discloses a self - balancing gantry lifting system for four - point hoisting and installing floor steel beams, which includes concrete columns, gantry columns, gantry beams, lifting beams, counterweight blocks and hoisting and lifting structures. The gantry columns are fixedly connected to the concrete columns on the same axis, the gantry beams are fixedly connected to the gantry columns, the lifting beams are rotatable on the gantry beams through pin shafts. One end of the counterweight block and the lifting beam is fixedly connected through a counterweight cable. The distance between the connection node of the counterweight cable on the lifting beam and the pin shaft is the counterweight arm. The hoisting and lifting structure is used for hoisting steel beams and is arranged at the other end of the lifting beam. The distance between the connection node of the hoisting and lifting structure on the lifting beam and the pin shaft is the hoisting arm, and the hoisting arm is less than the counterweight arm. By reasonably setting the lengths of the hoisting arm and the counterweight arm and using the lever principle, the present invention can reduce the weight of the counterweight, set up a light hoisting and lifting structure for hoisting steel beams with large spans and large weights, without the need to reinforce the floor surface, and has low construction costs.

Description

Technical Field

[0001] The invention belongs to the technical field of steel structure building construction, and particularly relates to a self-balancing gantry lifting system for four-point lifting and installing floor steel beams. Background Art

[0002] With the progress of science and technology and the continuous improvement of the economic foundation in China, cities across the country are working hard to strengthen infrastructure construction to improve the living standards of the people. The development of the long-span high-rise building industry has also followed closely, making the long-span high-rise building industry play a crucial role in the construction and development of cities.

[0003] Due to the continuous innovation and change of the structure and architectural style of long-span high-rise buildings in line with the times, this poses challenges to the construction personnel of long-span high-rise buildings.

[0004] During the construction of the steel structure of long-span floors and roofs, there are difficulties in hoisting, specifically:

[0005] (1) If large mobile lifting machinery and equipment are set up on the concrete floor, it is necessary to reinforce the floor. The reinforcement cost is high and uneconomical. At the same time, it is difficult to arrange the large mobile lifting machinery and equipment at the concrete floor.

[0006] (2) If a large tower crane is set up, the current tower crane specifications and models are difficult to meet the hoisting of large-tonnage and large-span steel components. Even if there is a tower crane that meets the requirements of large-tonnage and large-span hoisting, the foundation required for the tower crane is large, the utilization efficiency of the tower crane machinery is extremely low, and the cost is high at the same time.

[0007] (3) When using hydraulic lifting, it is necessary to set up a large construction platform on the top of the concrete column to place the hydraulic lifter. The cost of the safety guarantee measures required for the stability of the large platform is high. At the same time, the bearing requirement for the lower concrete column is high. Summary of the Invention

[0008] The purpose of the invention is to solve the above technical problems existing in the prior art, and provide a self-balancing gantry lifting system for four-point lifting and installing floor steel beams. By reasonably setting the lengths of the boom and the counterweight arm, and using the lever principle, the counterweight weight can be reduced, and a light lifting structure is set up to lift steel beams with large spans and large weights, without the need to reinforce the floor, and the construction cost is low and the construction period is guaranteed.

[0009] In order to solve the above technical problems, the invention adopts the following technical solutions:

[0010] Self-balanced gantry lifting system for four-point lifting and installing floor steel beams, including multiple concrete columns, characterized in that it further includes gantry columns, gantry beams, hanging beams, counterweight blocks and hoisting and lifting structures. The gantry columns are fixedly connected to the concrete columns on the same axis, the gantry beams are fixedly connected to the gantry columns, the hanging beams are rotatably connected to the gantry beams through pins, one end of the counterweight block and the hanging beam are fixedly connected through a counterweight cable, and the distance between the connection node of the counterweight cable on the hanging beam and the pin is the counterweight arm. The hoisting and lifting structure is used for hoisting steel beams, and the hoisting and lifting structure is arranged at the other end of the hanging beam. The distance between the connection node of the hoisting and lifting structure on the hanging beam and the pin is the hoisting arm, and the hoisting arm is less than the counterweight arm.

[0011] In the present invention, the gantry columns, gantry beams and hanging beams adopted are light in weight, and can be installed and positioned by using a conventional tower crane on site, with convenient operation and high installation efficiency. Moreover, the concrete columns can meet the forces on the gantry columns, gantry beams and hanging beams, and there is no need to set reinforcement devices. The hanging beam of the present invention rotates on the gantry beam through a pin, which can ensure that the gantry column only has axial force and no bending moment, which is beneficial to giving full play to the excellent axial bearing performance of the concrete column. At the same time, the hanging beam can be used as a lever. By reasonably setting the lengths of the hoisting arm and the counterweight arm, the hoisting arm is made less than the counterweight arm. In this way, the lever principle can be used to set a counterweight block with a light weight at one end of the counterweight arm and a steel beam with a large weight at one end of the hoisting arm, which can reduce the weight of the counterweight. Under the action of the counterweight block, the hanging beam is in a balanced state. At this time, the steel beam is evenly arranged at a certain height from the floor surface. In this way, a light hoisting and lifting structure can be set to hoist steel beams with large spans and large weights, without the need to reinforce the floor surface, and the construction cost is low.

[0012] Furthermore, the hoisting and lifting structure includes a winch, a lifting pulley block and a running rope. The running rope is wound around the lifting pulley block. The lifting pulley block is installed between the hanging beam and the steel beam. The winch winds up the running rope, so that the running rope hoists the steel beam and can be used for lifting the steel beam.

[0013] Furthermore, four groups of hoisting and lifting structures are adopted. One set of lifting pulley blocks is respectively arranged at the four lifting points of the steel beam. The lifting pulley block includes an upper fixed pulley block and a lower movable pulley block. The upper fixed pulley block is fixed on the hanging beam, and the lower movable pulley block is fixedly connected to one of the lifting points of the steel beam. The running rope is wound between the upper fixed pulley block and the lower movable pulley block. By winding up the running rope by the winch, the distance between the upper fixed pulley block and the lower movable pulley block is shortened, so that the steel beam is hoisted and lifted. By changing the direction of the force through the upper fixed pulley block and the lower movable pulley block, the object can be pulled very labor-savingly, so that the winch can hoist the steel beam.

[0014] Furthermore, the present invention uses four lifting points to lift the steel beam. There may be diagonal balance, resulting in only two winches being stressed while the other two winches are not, posing potential safety and quality hazards. At the same time, there are certain differences in the speeds of the winches, which will cause inconsistent forces on each lifting point and easily lead to the torsion of the steel beam, creating safety and quality hazards. In response to the above technical problems, the present invention designs the following solutions: Four winches are used for winding, namely winch A, winch B, winch C, and winch D.

[0015] A running rope, specifically running rope A, is wound between two groups of lifting pulley blocks on one side of the gantry beam. One end of running rope A is wound by winch A, and the other end of running rope A is wound by winch B. Both winch A and winch B are fixed on the floor. The gantry beam is fixedly connected with two symmetric first guide pulleys, and running rope A passes around the first guide pulleys to ensure that winch A and winch B are stressed simultaneously and uniformly.

[0016] On the other side of the gantry beam, each of the two groups of lifting pulley blocks is wound with a running rope, specifically running rope B and running rope C. Running rope B is wound by winch C, and running rope C is wound by winch D. Winch C and winch D are unidirectionally slidably connected to the sliding device on the floor. Winch C and winch D move forward and backward in the same direction. A balance steel wire rope is fixedly connected between winch C and winch D. The floor is fixedly connected with a guide pulley, and the balance steel wire rope slides on the guide pulley. Winch C and winch D are connected in series through the balance steel wire rope. When winch C moves forward, winch D moves backward, and when winch C moves backward, winch D moves forward, which can adjust the positions of winch C and winch D to ensure that winch C and winch D are stressed simultaneously and uniformly.

[0017] With the above solution, the present invention uses a single running rope to pass around 2 sets of lifting pulley blocks at two lifting points on the same side of the steel beam. The two ends of the running rope enter winch A and winch B respectively. When winch A and winch B wind the same running rope, it ensures that two of the lifting points on the same side of the steel beam are stressed simultaneously. On the other two lifting points on the other side of the steel beam, 1 set of lifting pulley blocks is used respectively. Each set of lifting pulley blocks is wound with 1 running rope. One end of the running rope is fixed on the lifting pulley block, and the other end passes around the lifting pulley block and then enters winch C or winch D. Winch C and winch D can only slide along the direction of the running rope, restricting lateral movement. When the tails of winch C and winch D are connected in series with a balance steel wire rope and a guide pulley, the positions of winch C and winch D can be adjusted to ensure that winch C and winch D are stressed synchronously, and further ensure that the other two lifting points on the same side of the steel beam are stressed simultaneously, enabling all four winches to be stressed and the four lifting points on the steel beam to be stressed uniformly, capable of lifting the steel beam while maintaining balance, improving the safety of steel beam lifting, and enabling the assembly and simultaneous lifting of two main beams, ensuring the out-of-plane stability of the long-span steel structure.

[0018] Further, the sliding device includes a winch guide rail and rollers. The rollers are arranged in parallel on the winch guide rail and roll on the winch guide rail. The winch guide rail is fixed on the floor surface. The winch C or the winch D moves on the rollers, ensuring that the winch can only perform one-way sliding along the running rope direction and restricting lateral movement.

[0019] Further, the winch guide rail includes a bottom plate and side plates. Two side plates are welded to the bottom plate. The bottom plate is fixed on the floor surface by bolts. The side plates are provided with mounting holes, and the rollers rotate in the mounting holes. A reinforcing plate is welded between the two side plates, so that a cavity is formed between the side plates, the bottom plate and the reinforcing plate, facilitating the rollers to extend into the cavity through the mounting holes, ensuring smooth rotation of the rollers on the winch guide rail and improving the stability of the rollers at the same time.

[0020] Further, if the moving distance of the winch C or the winch D is relatively large, it is easy to cause torsion during the lifting of the steel beam, resulting in large deformation of the steel beam. To solve this technical problem, the present invention sets two safety control ropes in the area between the winch C and the winch D, specifically the safety control rope A and the safety control rope B. One end of the safety control rope A is fixed on the floor surface, and the other end of the safety control rope A is locked with the balance steel wire rope through a buckle, and the locking position is close to the winch C. One end of the safety control rope B is fixed on the floor surface, and the other end of the safety control rope B is locked with the balance steel wire rope through a buckle, and the locking position is close to the winch D. The safety control rope A and the safety control rope B limit the moving distance of the winch C and the winch D, and the sliding distance of the safety control rope A and the safety control rope B should not be too large. When the moving distance of the winch C or the winch D exceeds the specified value, the synchronous lifting must be stopped, and then the single winch is operated by jogging to adjust the elevation of the steel beam structure and the control length of the safety rope, so that the relative elevation attitude of the steel beam structure is consistent with the design, and large deformation caused by torsion of the steel beam is avoided.

[0021] Further, the concrete column is fixedly connected with a second guide pulley, and the second guide pulley guides the running rope wound out by the lifting pulley block. A third guide pulley is fixed on the floor surface, and the third guide pulley guides the running rope to the winch, which can change the direction of the running rope.

[0022] Further, the gantry column and the concrete column are rigidly connected. The rigid connection structure generally adopts a base welded by steel structure, avoiding the drawback of setting guy ropes for the stability of the gantry and further avoiding the influence of the setting of guy ropes on other related construction operations. The gantry beam and the gantry column are hinged and connected by bolts. Multiple sections of gantry beams can be installed and the gantry beams are kept on the same horizontal line to ensure the safety of the steel beam lifting.

[0023] Further, the concrete column is fixedly connected with a sliding track. When the steel beam is lowered onto the sliding track, the steel beam moves on the sliding track, and the steel beam slides to the designed horizontal position and is erected in place. The installation can be repeated in a cycle to complete the installation of all steel beams.

[0024] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0025] (1) In the present invention, the gantry columns, gantry beams and hanging beams adopted are relatively light in weight, and can be installed and erected by using the conventional tower crane on site. The operation is convenient, the installation efficiency is high, and the concrete column can bear the forces on the gantry columns, gantry beams and hanging beams, and there is no need to set reinforcement devices. The hanging beam of the present invention rotates on the gantry beam through a pin shaft, which can ensure that the gantry column only has axial force and no bending moment, which is beneficial to giving full play to the excellent axial bearing performance of the concrete column; at the same time, the hanging beam can be used as a lever. By reasonably setting the lengths of the boom and the counterweight arm, the boom is made smaller than the counterweight arm. In this way, the lever principle can be used to set a relatively light counterweight block at one end of the counterweight arm and a heavy steel beam at one end of the boom, which can reduce the counterweight weight. Under the action of the counterweight block, the hanging beam is in a balanced state. At this time, the steel beam is balancedly arranged at a certain height from the floor surface. In this way, a light hoisting and lifting structure can be set to hoist large-span and heavy-weight steel beams without strengthening the floor surface, and the construction cost is low and the construction period is guaranteed.

[0026] (2) In the present invention, one running rope is wound around 2 sets of lifting pulley blocks at two lifting points on the same side of the steel beam, and the two ends of the running rope respectively enter the winch A and the winch B. When the winch A and the winch B wind up the same running rope, it is ensured that two of the lifting points on the same side of the steel beam are stressed simultaneously. At the two lifting points on the other side of the steel beam, 1 set of lifting pulley blocks is respectively adopted, and each set of lifting pulley blocks is wound around 1 running rope. One end of the running rope is fixed on the lifting pulley block, and the other end enters the winch C or the winch D after winding around the lifting pulley block. The winch C and the winch D can only slide along the direction of the running rope to limit the lateral movement. When the tails of the winch C and the winch D are connected in series by a balance steel wire rope and a guiding pulley, the positions of the winch C and the winch D can be adjusted to ensure that the winch C and the winch D are stressed synchronously, and further ensure that the other two lifting points on the same side of the steel beam are stressed simultaneously, so that all four winches can be stressed, and the four lifting points on the steel beam are stressed uniformly, which can lift the steel beam while keeping it balanced, improve the safety of lifting the steel beam, and can lift two main girders assembled together to ensure the out-of-plane stability of the large-span steel structure. Description of the Drawings

[0027] The present invention will be further described below with reference to the drawings:

[0028] Figure 1Schematic diagram of the self - balancing gantry lifting system for four - point lifting and installing floor steel beams in the present invention;

[0029] Figure 2 Schematic elevation layout diagram of the present invention;

[0030] Figure 3 For Figure 2 Schematic diagram of the structure in the A - A direction in

[0031] Figure 4 For Figure 2 Schematic diagram of the structure in the B - B direction in

[0032] Figure 5 Side view of the connection between the gantry column, gantry beam, hanging beam and counterweight in the present invention;

[0033] Figure 6 Stereogram of the connection between the gantry column, gantry beam, hanging beam and counterweight in the present invention;

[0034] Figure 7 Schematic diagram of the structure of the sliding device in the present invention;

[0035] Figure 8 Schematic diagram of the structure with the hoist C arranged on the sliding device in the present invention;

[0036] Figure 9 Schematic plan layout diagram of the installation tooling in the present invention.

[0037] In the figure, 1 - concrete column; 2 - gantry column; 3 - gantry beam; 4 - hanging beam; 5 - counterweight cable; 6 - steel beam; 7 - floor; 8 - lifting pulley block; 9 - hoist A; 10 - hoist B; 11 - hoist C; 12 - hoist D; 13 - running rope A; 14 - running rope B; 15 - running rope C; 16 - sliding device; 17 - balance steel wire rope; 18 - safety control rope A; 19 - counterweight; 20 - pin shaft; 21 - second guide pulley; 22 - third guide pulley; 23 - first guide pulley; 24 - upper fixed pulley block; 25 - lower movable pulley block; 26 - hoist guide rail; 27 - roller; 28 - side plate; 29 - bottom plate; 30 - reinforcing plate; 31 - safety control rope B; 32 - sliding track; L1 - counterweight arm; L2 - lifting arm. Detailed implementation mode

[0038] As Figures 1 to 9As shown in the figure, the self - balancing gantry lifting system of the present invention for four - point hoisting and installing floor steel beams includes multiple sections of concrete columns 1, gantry columns 2, gantry beams 3, lifting beams 4, counterweight blocks 19, and a hoisting and lifting structure. The gantry columns 2 are fixedly connected to the concrete columns 1 on the same axis, and the gantry columns 2 and the concrete columns 1 are rigidly connected. The rigid connection structure generally adopts a base welded by steel structures, avoiding the drawback of setting guy wires for gantry stability and further avoiding the influence of guy wire setting on other related construction operations. The gantry beam 3 is fixedly connected to the gantry column 2, and the gantry beam 3 and the gantry column 2 are hinged by bolts. Multiple sections of gantry beams 3 can be installed and kept on the same horizontal line to ensure the safety of steel beam lifting. The lifting beam 4 rotates on the gantry beam 3 through a pin shaft 20. One end of the counterweight block 19 and the lifting beam 4 are fixedly connected by a counterweight cable 5. An ear plate is arranged on the lifting beam 4, and the counterweight cable 5 is connected to this ear plate. The distance between the connection node of the counterweight cable 5 on the lifting beam 4 and the pin shaft 20 is the counterweight arm L1. The hoisting and lifting structure is used to hoist the steel beam 6, and the hoisting and lifting structure is arranged at the other end of the lifting beam 4. Generally, an ear plate is arranged at the other end of the lifting beam 4, and the hoisting and lifting structure is connected to this ear plate. The distance between the connection node of the hoisting and lifting structure on the lifting beam 4 and the pin shaft 20 is the boom L2, and the boom L2 is less than the counterweight arm L1. The steel beam 6 of the present invention is assembled on the floor 7, and secondary steel beams are installed between two adjacent main steel beams to form a stable unit.

[0039] In the present invention, the gantry columns 2, gantry beams 3, and lifting beams 4 adopted are relatively light in weight, and can be installed and positioned by using a conventional tower crane on the site. The operation is convenient, the installation efficiency is high, and the concrete columns 1 can bear the forces on the gantry columns 2, gantry beams 3, and lifting beams 4, without the need to set reinforcement devices. The lifting beam 4 of the present invention rotates on the gantry beam 3 through a pin shaft 20, which can ensure that the gantry column 2 only has axial force and no bending moment, which is beneficial to giving full play to the excellent axial bearing performance of the concrete column 1. At the same time, the lifting beam 4 can be used as a lever. By reasonably setting the lengths of the boom L2 and the counterweight arm L1, the boom L2 is less than the counterweight arm L1. In this way, the lever principle can be utilized. A relatively light counterweight block 19 is arranged at one end of the counterweight arm L1, and a heavy steel beam 6 is arranged at one end of the boom L2, which can reduce the counterweight weight. Under the action of the counterweight block 19, the lifting beam 4 is in a balanced state. At this time, the steel beam 6 is balancedly arranged at a certain height from the floor 7. In this way, a light hoisting and lifting structure can be set to hoist a long - span and heavy - weight steel beam 6, without the need to reinforce the floor 7, and the construction cost is low and the construction period is guaranteed.

[0040] The hoisting and lifting structure includes a winch, a lifting pulley block 8 and a hauling rope. The lifting pulley block 8 is installed between the hanging beam 4 and the steel beam 6. The winch winds the hauling rope, causing the hauling rope to lift the steel beam 6, which can be used for lifting the steel beam 6. A set of lifting pulley blocks 8 is provided at each of the four lifting points of the steel beam 6. The lifting pulley block 8 includes an upper fixed pulley block 24 and a lower movable pulley block 25. The upper fixed pulley block 24 is fixed on the hanging beam 4, and the lower movable pulley block 25 is fixedly connected to one of the lifting points of the steel beam 6. The hauling rope is wound between the upper fixed pulley block 24 and the lower movable pulley block 25. By winding the hauling rope with the winch, the distance between the upper fixed pulley block 24 and the lower movable pulley block 25 is shortened, causing the steel beam 6 to be lifted and rise. By changing the direction of the force through the upper fixed pulley block 24 and the lower movable pulley block 25, the object can be pulled very labor - savingly, enabling the winch to lift the steel beam.

[0041] The present invention uses four lifting points to lift the steel beam 6. There may be diagonal balance, resulting in only two winches being stressed while the other two winches are not, presenting potential safety and quality hazards. At the same time, there are certain differences in the speeds of the winches, which will cause inconsistent forces on each lifting point, easily leading to the torsion of the steel beam 6 and causing potential safety and quality hazards. In response to the above - mentioned technical problems, the present invention designs the following solution: Four winches are used for winding, namely winch A9, winch B10, winch C11 and winch D12.

[0042] A hauling rope is wound between two sets of lifting pulley blocks 8 on one side of the gantry beam 3, specifically the hauling rope A13. One end of the hauling rope A13 is wound by the winch A9, and the other end of the hauling rope A13 is wound by the winch B10. Both the winch A9 and the winch B10 are fixed on the floor 7. The gantry beam 3 is fixedly connected with two symmetric first guide pulleys 23. The hauling rope A13 is wound around the first guide pulleys 23 to ensure that the winch A9 and the winch B10 are stressed simultaneously and uniformly.

[0043] Two sets of lifting pulley blocks 8 on the other side of the gantry beam 3 are each wound with a hauling rope, specifically the hauling rope B14 and the hauling rope C15. The hauling rope B14 is wound by the winch C11, and the hauling rope C15 is wound by the winch D12. The winch C11 and the winch D12 are unidirectionally slidably connected to the sliding device 16 on the floor 7. The winch C11 and the winch D12 move forward and backward in the same direction. A balance steel wire rope 17 is fixedly connected between the winch C11 and the winch D12. The floor 7 is fixedly connected with a guide pulley. The balance steel wire rope 17 slides on the guide pulley. The winch C11 and the winch D12 are connected in series through the balance steel wire rope. When the winch C11 moves forward, the winch D12 moves backward; when the winch C11 moves backward, the winch D12 moves forward, which can adjust the positions of the winch C11 and the winch D12 to ensure that the winch C11 and the winch D12 are stressed simultaneously and uniformly.

[0044] With the above solution, in the present invention, a single hauling rope is used to wind around two sets of lifting pulley blocks 8 at two lifting points on the same side of the steel beam 6, and the two ends of the hauling rope respectively enter the winch A9 and the winch B10. When the winch A9 and the winch B10 wind the same hauling rope, it is ensured that two of the lifting points on the same side of the steel beam 6 are stressed simultaneously. At the two lifting points on the other side of the steel beam 6, one set of lifting pulley blocks 8 is respectively used. Each set of lifting pulley blocks 8 is wound around a hauling rope. One end of the hauling rope is fixed to the lifting pulley block 8, and the other end enters the winch C11 or the winch D12 after winding around the lifting pulley block 8. The winches C11 and D12 can only slide along the direction of the hauling rope, restricting lateral movement. When the tails of the winch C11 and the winch D12 are connected in series by a balance steel wire rope 17 and a guiding pulley, the positions of the winch C11 and the winch D12 can be adjusted to ensure that the winch C11 and the winch D12 are stressed synchronously, and further ensure that the other two lifting points on the same side of the steel beam 6 are stressed simultaneously, enabling all four winches to be stressed, making the four lifting points on the steel beam 6 stressed uniformly, capable of lifting the steel beam 6 while maintaining balance, improving the safety of lifting the steel beam 6, and enabling the assembly of two main girders to be lifted together, ensuring the out-of-plane stability of the large-span steel structure.

[0045] The sliding device 16 includes a winch guide rail 26 and rollers 27. The rollers 27 are arranged in parallel on the winch guide rail 26 and roll on the winch guide rail 26. The winch guide rail 26 is fixed to the floor 7. The winch C11 or the winch D12 moves on the rollers 27 to ensure that the winch can only perform one-way sliding along the direction of the hauling rope, restricting lateral movement. The winch guide rail 26 includes a bottom plate 29 and side plates 28. Two side plates 28 are welded to the bottom plate 29. The bottom plate 29 is fixed to the floor 7 by bolts. The side plates 28 are provided with mounting holes, and the rollers 27 rotate in the mounting holes. A reinforcing plate 30 is welded between the two side plates 28, forming a cavity between the side plates 28, the bottom plate 29, and the reinforcing plate 30, facilitating the rollers 27 to extend into the cavity through the mounting holes, ensuring smooth rotation of the rollers 27 on the winch guide rail 26 and improving the stability of the rollers 27 at the same time.

[0046] If the moving distance of the hoist C11 or the hoist D12 is relatively large, it is likely to cause torsion during the lifting of the steel beam, resulting in large deformation of the steel beam. To address this technical problem, the present invention provides two safety control ropes in the area between the hoist C11 and the hoist D12, specifically the safety control rope A18 and the safety control rope B31. One end of the safety control rope A18 is fixed to the floor 7, and the other end of the safety control rope A18 is locked with the balance steel wire rope 17 through a buckle, and the locking position is close to the hoist C11. One end of the safety control rope B31 is fixed to the floor 7, and the other end of the safety control rope B31 is locked with the balance steel wire rope 17 through a buckle, and the locking position is close to the hoist D12. The safety control rope A18 and the safety control rope B31 limit the moving distance of the hoist C11 and the hoist D12, and the sliding distance of the safety control rope A18 and the safety control rope B31 should not be too large. When the moving distance of the hoist C11 or the hoist D12 exceeds the specified value, the synchronous lifting must be stopped, and then the single hoist is operated by jogging to adjust the elevation of the steel beam structure and the control length of the safety rope, so that the relative elevation attitude of the steel beam structure is consistent with the design, and large deformation caused by torsion of the steel beam is avoided.

[0047] The concrete column 1 is fixedly connected with a second guide pulley 21. The second guide pulley 21 guides the running rope wound out by the lifting pulley block 8. A third guide pulley 22 is fixed on the floor 7. The third guide pulley 22 guides the running rope to the hoist, which can change the direction of the running rope.

[0048] The concrete column 1 is fixedly connected with a sliding track 32. When the steel beam 6 is lowered onto the sliding track 32, the steel beam 6 moves on the sliding track 32. The steel beam 6 slides to the designed horizontal position and is jacked down and positioned. This can be repeatedly installed in a cycle to complete the installation of the secondary truss.

[0049] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve substantially the same technical problems and achieve substantially the same technical effects are all covered by the protection scope of the present invention.

Claims

1. A self - balancing gantry lifting system for four - point lifting and installing floor steel beams, comprising: a concrete column; It is characterized in that it further comprises: a gantry column, the gantry column is fixedly connected to the concrete columns on the same axis; a gantry beam, the gantry beam is fixedly connected to the gantry column; a lifting beam, the lifting beam rotates on the gantry beam through a pin shaft; a counterweight block, the counterweight block and one end of the lifting beam are fixedly connected by a counterweight cable, and the distance between the connection node of the counterweight cable on the lifting beam and the pin shaft is the counterweight arm; a hoisting and lifting structure for hoisting the steel beam, the hoisting and lifting structure is arranged at the other end of the lifting beam, and the distance between the connection node of the hoisting and lifting structure on the lifting beam and the pin shaft is the hoisting arm, and the hoisting arm is less than the counterweight arm; The hoisting and lifting structure includes a winch, a lifting pulley block and a running rope, the running rope is wound around the lifting pulley block, the lifting pulley block is installed between the lifting beam and the steel beam, and the winch winds the running rope to lift the steel beam with the running rope; Four groups of the hoisting and lifting structures are adopted, and one set of the lifting pulley blocks is respectively arranged at the four lifting points of the steel beam. The lifting pulley block includes an upper fixed pulley group and a lower movable pulley group. The upper fixed pulley group is fixed on the lifting beam, and the lower movable pulley group is fixedly connected to one of the lifting points of the steel beam. The running rope is wound between the upper fixed pulley group and the lower movable pulley group. By winding the running rope by the winch, the distance between the upper fixed pulley group and the lower movable pulley group is shortened to lift the steel beam; Four winches are used for winding, namely winch A, winch B, winch C and winch D. A running rope, specifically running rope A, is wound between two sets of the lifting pulley blocks on one side of the gantry beam. One end of the running rope A is wound by winch A, and the other end of the running rope A is wound by winch B. Both winch A and winch B are fixed on the floor. Two symmetric first guide wheels are fixedly connected to the gantry beam, and the running rope A is wound around the first guide wheels. One running rope is respectively wound around two sets of the lifting pulley blocks on the other side of the gantry beam, specifically running rope B and running rope C. Running rope B is wound by winch C, and running rope C is wound by winch D. Winch C and winch D are unidirectionally slidably connected to a sliding device on the floor. Winch C and winch D move forward and backward in the same direction. A balance steel wire rope is fixedly connected between the tails of winch C and winch D. A guide pulley is fixedly connected to the floor, and the balance steel wire rope slides on the guide pulley for series connection. When winch C moves forward, winch D moves backward, and when winch C moves backward, winch D moves forward.

2. The self - balancing gantry lifting system for four - point lifting and installing floor steel beams according to claim 1, characterized in that: The sliding device includes a winch guide rail and rollers. The rollers are arranged in parallel on the winch guide rail and roll on the winch guide rail. The winch guide rail is fixed on the floor, and the winch C or the winch D moves on the rollers.

3. The self-balanced gantry lifting system for four-point lifting and installing floor steel beams according to claim 2, characterized in that: The winch guide rail includes a bottom plate and side plates. Two side plates are welded to the bottom plate. The bottom plate is fixed to the floor by bolts. The side plates are provided with mounting holes, and the rollers rotate in the mounting holes. A reinforcing plate is welded between the two side plates.

4. The self-balanced gantry lifting system for four-point lifting and installing floor steel beams according to claim 1, characterized in that: Two safety control ropes are arranged in the area between the winch C and the winch D, specifically the safety control rope A and the safety control rope B. One end of the safety control rope A is fixed on the floor, and the other end of the safety control rope A is locked with the balance steel wire rope through a buckle, and the locking position is close to the winch C. One end of the safety control rope B is fixed on the floor, and the other end of the safety control rope B is locked with the balance steel wire rope through a buckle, and the locking position is close to the winch D.

5. The self-balanced gantry lifting system for four-point lifting and installing floor steel beams according to claim 1, characterized in that: The concrete column is fixedly connected with a second guide pulley. The second guide pulley guides the running rope wound out by the lifting pulley block. A third guide pulley is fixed on the floor, and the third guide pulley guides the running rope to the winch.

6. The self-balanced gantry lifting system for four-point lifting and installing floor steel beams according to claim 1, characterized in that: The gantry column and the concrete column are rigidly connected, and the gantry beam and the gantry column are hinged and connected by bolts.

7. The self-balanced gantry lifting system for four-point lifting and installing floor steel beams according to claim 1, characterized in that: The concrete column is fixedly connected with a sliding track. When the steel beam is lowered onto the sliding track, the steel beam moves on the sliding track, and the steel beam slides to the designed horizontal position and is jacked down and positioned.

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