A lifting beam operation platform with automatic leveling function and construction method

Abstract

The application discloses a beam lifting operation platform with an automatic leveling function and a construction method, the beam lifting operation platform with the automatic leveling function comprises two groups of supporting supports and mounting supports, a hoisting device is connected to the mounting supports, a lifting beam is connected to a movable end of the hoisting device, a first lifting rope and a second lifting rope are arranged on the lifting beam, the first lifting rope and the second lifting rope are connected with a precast box girder, a first inclination sensor and a second inclination sensor are arranged on the precast box girder, the first inclination sensor is electrically connected with the hoisting device, an adjusting assembly is arranged on each lifting beam, and the adjusting assembly is electrically connected with the second inclination sensor. The postures of the precast box girder are monitored by using the first inclination sensor and the second inclination sensor, and the inclination of the precast box girder monitored is sent to the hoisting device and the adjusting assembly, so that automatic leveling is completed in the hoisting process, the posture balance of the precast box girder is ensured, the possibility of torsional cracking of the precast box girder is reduced, the time of additional adjustment is reduced, and the construction efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of beam lifting operation technology, and in particular to a beam lifting operation platform with automatic leveling function and a construction method thereof. Background Technology

[0002] Precast box girders are box-shaped concrete beams that are first made in a factory or prefabrication yard and then transported to the construction site for installation on corresponding piers. They are mainly used for bridge construction and can speed up construction efficiency.

[0003] Precast box girders are typically hoisted using multiple lifting devices, such as truck cranes and crawler cranes. However, the balance of the precast box girders is difficult to control during the hoisting process, which requires a lot of time to adjust when placing the precast box girders, and can easily affect the construction schedule. Summary of the Invention

[0004] The purpose of this application is to provide a beam lifting platform and construction method with automatic leveling function to improve the problem of difficulty in controlling the balance during the hoisting of existing precast box girders.

[0005] Firstly, this application provides a beam-lifting operation platform with automatic leveling function, which adopts the following technical solution: A beam-lifting platform with automatic leveling function includes two sets of support brackets and mounting brackets. Each set of support brackets has two members, which are installed on the ground on both sides of the bridge pier. Each set of mounting brackets is installed on the two support brackets. Each mounting bracket is connected to a hoisting device. The movable end of each hoisting device is connected to a lifting beam. Each lifting beam is equipped with a first lifting rope and a second lifting rope for connecting to a precast box girder. Each set of first and second lifting ropes is connected to both sides of the precast box girder. The precast box girder is equipped with a first tilt sensor and a second tilt sensor. The first tilt sensor is electrically connected to the two sets of hoisting devices. Each lifting beam is equipped with an adjustment component for adjusting the extension length of the first and second lifting ropes. The two sets of adjustment components are electrically connected to the second tilt sensor.

[0006] By adopting the above technical solution, the attitude of the precast box girder is monitored using a first tilt sensor and a second tilt sensor, and the monitored tilt of the precast box girder is sent to the hoisting device and adjustment component. The hoisting device and adjustment component automatically level the precast box girder during the hoisting process, which not only ensures the attitude balance of the precast box girder and reduces the possibility of torsional cracking, but also reduces the additional adjustment time and improves construction efficiency.

[0007] Optionally, the hoisting device includes a traveling frame and a hoisting winch. The traveling frame is mounted on the mounting bracket via a traveling assembly, and the hoisting winch is connected to the hoisting beam via slings. The hoisting winch is electrically connected to a first tilt sensor.

[0008] The above technical solution allows the precast box girder to be easily lifted by a hoisting winch, while the traveling assembly can move the hoisting winch and the precast box girder along the mounting bracket to lower the precast box girder to the designed position.

[0009] Optionally, the adjustment assembly includes a balance bar and a first hydraulic cylinder. The balance bar is rotatably connected to the middle position of the lifting beam. One end of the balance bar is connected to a first lifting rope, and the other end is connected to a second lifting rope. The first hydraulic cylinder is installed on the inner wall of the lifting beam, and the piston rod of the first hydraulic cylinder abuts against the side wall of the balance bar to drive the balance bar to rotate.

[0010] The above technical solution uses a first hydraulic cylinder to drive the balance bar to rotate, thereby adjusting the extension length of the first and second lifting ropes and making minor adjustments to the angle of the precast box girder. In this way, the piston rod of the first hydraulic cylinder needs to withstand less pressure, so a small hydraulic cylinder can be used to achieve lightweight lifting of the girder. At the same time, when the production and assembly precision of the precast box girder is high, the balance bar itself can also directly complete the balance in the width direction of the precast box girder, achieving self-balancing.

[0011] Optionally, the adjustment assembly further includes a second hydraulic cylinder, which is mounted on the inner wall of the lifting beam. The piston rod of the second hydraulic cylinder abuts against the side wall of the balance bar. The first hydraulic cylinder and the second hydraulic cylinder are located on both sides of the balance bar and the rotating shaft of the lifting beam.

[0012] Through the above technical solution, the first hydraulic cylinder and the second hydraulic cylinder cooperate with each other to more stably adjust the angle of the balance bar, and at the same time, the first hydraulic cylinder and the second hydraulic cylinder can be further balanced.

[0013] Optionally, a miniature hydraulic pump is also installed inside the lifting beam. The input end of the miniature hydraulic pump is connected to an oil tank, and the output end of the miniature hydraulic pump is connected to a first hydraulic cylinder. The first hydraulic cylinder is connected to a second hydraulic cylinder so that when the piston rod of the first hydraulic cylinder extends, the piston rod of the second hydraulic cylinder retracts, or when the piston rod of the second hydraulic cylinder extends, the piston rod of the first hydraulic cylinder retracts. A control component is provided between the miniature hydraulic pump and the first and second hydraulic cylinders, and the control component is electrically connected to a second tilt sensor.

[0014] Through the above technical solution, the micro hydraulic pump can provide power to the first hydraulic pump and the second hydraulic pump, and at the same time, the control component can control the power output of the first hydraulic cylinder and the second hydraulic cylinder to adjust the angle of the precast box girder.

[0015] Optionally, a first guide wheel and a second guide wheel are rotatably connected to the lifting beam. The first guide wheel and the second guide wheel are located at both ends of the lifting beam. The first lifting rope passes over the first guide wheel, and the second lifting rope passes over the second guide wheel.

[0016] By adopting the above technical solution, the first guide wheel and the second guide wheel can easily guide the first and second lifting ropes, while reducing friction.

[0017] Optionally, the precast box girder is fitted with a protective frame, which is connected to the first lifting rope and the second lifting rope.

[0018] By adopting the above technical solution, the protective frame can easily protect the precast box girder, reduce the possibility of damage to the precast box girder during hoisting, and also facilitate the connection with the first and second hoisting ropes, eliminating the need to install lifting rings on the precast box girder.

[0019] Optionally, the protective frame includes a base plate with two supporting diagonal braces. A receiving area for accommodating the precast box girder is provided between the two supporting diagonal braces. When the precast box girder is located within the receiving area, it contacts the two supporting diagonal braces and has a gap with the base plate. A reinforcing vertical bar connects the base plate to each supporting diagonal brace. A flat bar is connected to the end of each supporting diagonal brace away from the base plate. A reinforcing diagonal brace connects to each flat bar. A vertical mounting rod is connected to each flat bar. A pressure plate connects between two vertical mounting rods. The pressure plate abuts against the top surface of the precast box girder. A first lifting ring is connected to each vertical mounting rod. One first lifting ring is connected to a first lifting rope, and the other first lifting ring is connected to a second lifting rope.

[0020] Through the above technical solution, the two supporting diagonal rods facilitate the support of the precast box girder, while the reinforcing diagonal rods and reinforcing vertical rods facilitate the reinforcement of the supporting diagonal rods and reduce the possibility of deformation. The first lifting ring facilitates connection with the first and second lifting ropes.

[0021] Optionally, a second lifting ring is connected to the pressure plate, a lowering winch is installed on the ground, the lowering winch is connected to a lowering rope, and the end of the lowering rope away from the lowering winch passes through the second lifting ring and is connected to the first lifting ring.

[0022] Using the above technical solution, after the precast box girder is installed, the connection between the pressure plate and the vertical installation rod is first released, and the pressure plate is placed on the precast box girder. Then, the lowering rope is passed through the second lifting ring and connected to the first lifting ring. Then, the bottom plate and reinforcing diagonal rod are lowered by the lowering winch. After being lowered to the ground, the lowering rope is collected. Then, the first lifting rope and the second lifting rope are connected to the second lifting ring, and the pressure plate is hoisted to the ground.

[0023] Secondly, this application provides a construction method.

[0024] A construction method, based on the aforementioned beam-lifting platform with automatic leveling function, includes the following steps: S1. Connect the first and second lifting ropes of each group of lifting beams to the precast box girder; S2. The precast box girder is lifted into the air using a hoisting device; S3, the first tilt sensor and the second tilt sensor monitor the attitude of the precast box girder and send electrical signals to the hoisting device and adjustment components; S4. The hoisting device and adjustment components adjust the posture of the precast box girder until the precast box girder is leveled. S4. The hoisting device lowers the precast box girder onto the bridge pier.

[0025] In summary, this application includes at least one of the following beneficial technical effects: 1. The attitude of the precast box girder is monitored by the first and second tilt sensors, and the tilt of the precast box girder is sent to the hoisting device and adjustment component. The hoisting device and adjustment component automatically level the precast box girder during the hoisting process, which not only ensures the attitude balance of the precast box girder and reduces the possibility of torsional cracking, but also reduces the additional adjustment time and improves construction efficiency. 2. The lifting winch facilitates the lifting of the precast box girder, while the traveling assembly enables the lifting winch and the precast box girder to move along the mounting bracket so as to lower the precast box girder to the designed position; 3. The first hydraulic cylinder drives the balance bar to rotate, thereby adjusting the extension length of the first and second lifting ropes, and thus making a small adjustment to the angle of the precast box girder. At the same time, the piston rod of the first hydraulic cylinder needs to withstand less pressure, so a small hydraulic cylinder can be used to achieve the weight reduction of the lifting girder. In addition, when the production and assembly precision of the precast box girder is high, the balance bar itself can also directly complete the balance in the width direction of the precast box girder, achieving self-balancing. 4. The first and second hydraulic cylinders work together to more stably adjust the angle of the balance bar, and at the same time, the first and second hydraulic cylinders can further balance each other; 5. The miniature hydraulic pump can provide power to the first hydraulic pump and the second hydraulic pump, and at the same time, the control components can control the power output of the first hydraulic cylinder and the second hydraulic cylinder to adjust the angle of the precast box girder. 6. The protective frame facilitates the protection of the precast box girder, reducing the possibility of damage during hoisting. It also facilitates connection with the first and second hoisting ropes, eliminating the need to install lifting rings on the precast box girder. Attached Figure Description

[0026] Figure 1This is a front view of the beam lifting platform with automatic leveling function in this invention.

[0027] Figure 2 This is a side view of the overall lifting platform in this invention.

[0028] Figure 3 This is a three-dimensional schematic diagram illustrating the connection structure between the two sets of suspension beams and the precast box girder in this invention.

[0029] Figure 4 This is a schematic diagram illustrating the adjustment component in this invention.

[0030] Figure 5 This is a schematic diagram of the hydraulic circuit embodying the control component in this invention.

[0031] Figure 6 This is a schematic diagram illustrating the lowering winch in this invention.

[0032] In the diagram, 1. Support bracket; 2. Mounting bracket; 3. Lifting device; 31. Lifting sling; 4. Lifting beam; 41. First lifting rope; 42. Second lifting rope; 43. First guide wheel; 44. Second guide wheel; 5. Adjustment assembly; 51. Balance bar; 52. First hydraulic cylinder; 53. Second hydraulic cylinder; 54. Miniature hydraulic pump; 55. Oil tank; 56. Three-position four-way servo proportional control valve; 561. First check valve; 562. Second check valve; 563. First back pressure valve; 564. Second back pressure valve; 6. Protective frame; 61. Base plate; 62. Supporting diagonal bar; 63. Reinforcing vertical bar; 631. Reinforcing diagonal bar; 64. Planar bar; 65. Vertical mounting bar; 651. First screw; 652. Second screw; 66. Pressure plate; 661. Second lifting ring; 67. First lifting ring; 7. Lowering winch; 8. Precast box girder. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the invention, and therefore only show the components relevant to the invention.

[0034] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; as a mechanical connection or an electrical connection; as a direct connection or an indirect connection through an intermediate medium; or as a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] Example: In a first aspect, this application discloses a beam lifting platform with automatic leveling function.

[0036] A beam-lifting platform with automatic leveling function, referring to Figures 1 to 6 It includes two sets of support brackets 1 and mounting brackets 2. Each set of support brackets 1 has two brackets and is installed on the ground on both sides of the bridge pier. Each set of mounting brackets 2 is installed on the two support brackets 1. Each mounting bracket 2 is connected to a hoisting device 3. The movable end of each hoisting device 3 is connected to a lifting beam 4. Each lifting beam 4 is equipped with a first lifting rope 41 and a second lifting rope 42 for connecting to the precast box girder 8. Each set of first lifting ropes 41 and second lifting ropes 42 is connected to both sides of the precast box girder 8. The precast box girder 8 is equipped with a first tilt sensor and a second tilt sensor. The first tilt sensor is electrically connected to the two sets of hoisting devices 3. Each lifting beam 4 is equipped with an adjustment component 5 for adjusting the extension length of the first lifting rope 41 and the second lifting rope 42. The two sets of adjustment components 5 are electrically connected to the second tilt sensor.

[0037] The attitude of the precast box girder 8 is monitored by the first and second tilt sensors, and the tilt of the precast box girder 8 is sent to the hoisting device 3 and the adjustment component 5. The hoisting device 3 and the adjustment component 5 automatically level the precast box girder 8 during the hoisting process, which not only ensures the attitude balance of the precast box girder 8 and reduces the possibility of torsional cracking of the precast box girder 8, but also reduces the additional adjustment time and improves construction efficiency.

[0038] It should be noted that the first tilt sensor can monitor the precast box girder along 8... Figure 2 The tilt angle in the X direction, i.e., the angle affected by the difference in the lowest positions of the two suspension cables 31; the first tilt sensor can monitor the precast box girder 8 along the X direction. Figure 1 The tilt angle in the Y direction is the angle affected by the difference in the lowest position of the first suspension rope 41 and the second suspension rope 42.

[0039] Specifically, the hoisting device 3 includes a traveling frame and a hoisting winch. The traveling frame is mounted on the mounting bracket 2 via a traveling assembly. The hoisting winch is connected to the lifting beam 4 via slings 31. The motor controller of the hoisting winch is electrically connected to the first tilt sensor. The hoisting winch facilitates the lifting of the precast box beam 8, while the traveling assembly enables the hoisting winch and the precast box beam 8 to move along the mounting bracket 2, allowing the precast box beam 8 to be lowered to the designed position. The traveling assembly can be a traveling trolley, a gear and rack mechanism, a friction wheel and slide rail structure, etc., as long as it allows the hoisting winch to move along the mounting bracket 2.

[0040] Specifically, the adjustment assembly 5 includes a balance bar 51 and a first hydraulic cylinder 52. The balance bar 51 is rotatably connected to the middle position of the lifting beam 4. One end of the balance bar 51 is connected to the first lifting rope 41, and the other end is connected to the second lifting rope 42. The first hydraulic cylinder 52 is installed on the inner wall of the lifting beam 4, and the piston rod of the first hydraulic cylinder 52 abuts against the side wall of the balance bar 51 to drive the balance bar 51 to rotate. By pushing the balance bar 51 to rotate through the first hydraulic cylinder 52, the extension length of the first lifting rope 41 and the second lifting rope 42 is adjusted, thereby making a slight adjustment to the angle of the precast box girder 8. At the same time, in this way, the piston rod of the first hydraulic cylinder 52 needs to withstand less pressure, and a small hydraulic cylinder can be used to achieve the weight reduction of the lifting beam 4. In addition, when the production and assembly precision of the precast box girder 8 is high, the balance bar 51 itself can also directly complete the balancing of the width direction of the precast box girder 8, achieving self-balancing.

[0041] The adjusting assembly 5 also includes a second hydraulic cylinder 53, which is mounted on the inner wall of the lifting beam 4. The piston rod of the second hydraulic cylinder 53 abuts against the side wall of the balance bar 51. The first hydraulic cylinder 52 and the second hydraulic cylinder 53 are located on both sides of the pivot of the balance bar 51 and the lifting beam 4. The first hydraulic cylinder 52 and the second hydraulic cylinder 53 cooperate with each other to more stably adjust the angle of the balance bar 51, and at the same time, the first hydraulic cylinder 52 and the second hydraulic cylinder 53 can further balance the load.

[0042] A miniature hydraulic pump 54 is also installed inside the lifting beam 4. The input end of the miniature hydraulic pump 54 is connected to an oil tank 55, and the output end of the miniature hydraulic pump 54 is connected to a first hydraulic cylinder 52. The first hydraulic cylinder 52 is connected to a second hydraulic cylinder 53, so that when the piston rod of the first hydraulic cylinder 52 extends, the piston rod of the second hydraulic cylinder 53 retracts, or vice versa. A control component is provided between the miniature hydraulic pump 54 and the first and second hydraulic cylinders 52 and 53, and the control component is electrically connected to a second tilt sensor. The miniature hydraulic pump 54 can provide power to the first and second hydraulic pumps, and at the same time, the control component controls the power output of the first and second hydraulic cylinders 52 and 53 to adjust the angle of the precast box girder 8.

[0043] More specifically, the control components include a three-position four-way servo proportional control valve 56 to more precisely control the proportion of oil entering the first hydraulic cylinder 52 or the second hydraulic cylinder 53. Referring to the figure, when the piston rod of the first hydraulic cylinder 52 needs to extend, the three-position four-way servo proportional control valve 56 switches to the left position, and oil flows out from the hydraulic pump, passes through the first check valve 561, and enters the left chamber of the first hydraulic cylinder 52, causing the piston rod of the first hydraulic cylinder 52 to extend. At this time, the oil in the right chamber of the first hydraulic cylinder 52 enters the right chamber of the second hydraulic cylinder 53, pushing the piston rod of the second hydraulic cylinder 53 to retract. Simultaneously, the oil in the left chamber of the second hydraulic cylinder 53 flows into the oil tank 55 after passing through the first back pressure valve 563. When the piston rod of the second hydraulic cylinder 53 needs to extend, the three-position four-way servo proportional control valve 56 switches to the right position, and the oil flows out from the hydraulic pump, passes through the second check valve 562 and enters the left chamber of the second hydraulic cylinder 53. The piston rod of the second hydraulic cylinder 53 extends. At this time, the oil in the right chamber of the second hydraulic cylinder 53 enters the right chamber of the first hydraulic cylinder 52, pushing the piston rod of the first hydraulic cylinder 52 to retract. At the same time, the oil in the left chamber of the first hydraulic cylinder 52 flows into the oil tank 55 after passing through the second back pressure valve 564.

[0044] It should be noted that the first back pressure valve 563 and the second back pressure valve 564 can ensure the pressure of the return oil circuit, thereby ensuring that the piston rods of the first hydraulic cylinder 52 and the second hydraulic cylinder 53 maintain a certain pressure when retracting, improving the stability of the rotation of the balance bar 51. When the balance bar 51 is adjusted to the correct position, the three-position four-way servo proportional control valve 56 switches to the neutral position, so that the oil in the first hydraulic cylinder 52 and the second hydraulic cylinder 53 is locked in the hydraulic circuit, ensuring the stability of the output pressure of the piston rods of the first hydraulic cylinder 52 and the second hydraulic cylinder 53.

[0045] It should be noted that a first guide wheel 43 and a second guide wheel 44 are rotatably connected to the lifting beam 4. The first guide wheel 43 and the second guide wheel 44 are located at both ends of the lifting beam 4. The first lifting rope 41 passes through the first guide wheel 43, and the second lifting rope 42 passes through the second guide wheel 44. The first guide wheel 43 and the second guide wheel 44 facilitate the guidance of the first lifting rope 41 and the second lifting rope 42, while reducing friction.

[0046] The precast box girder 8 is fitted with a protective frame 6, which is connected to the first lifting rope 41 and the second lifting rope 42. The protective frame 6 facilitates the protection of the precast box girder 8, reducing the possibility of damage to the precast box girder 8 during hoisting. It also facilitates connection with the first lifting rope 41 and the second lifting rope 42, eliminating the need to install lifting rings on the precast box girder 8.

[0047] Specifically, the protective frame 6 includes a base plate 61, on which two supporting diagonal braces 62 are welded. A receiving area for accommodating a precast box girder 8 is provided between the two supporting diagonal braces 62. When the precast box girder 8 is located within the receiving area, it contacts the two supporting diagonal braces 62 and has a gap with the base plate 61. A reinforcing vertical brace 63 is welded between the base plate 61 and each supporting diagonal brace 62. A flat rod 64 is welded to the end of each supporting diagonal brace 62 away from the base plate 61. A reinforcing diagonal brace 631 is welded between each flat rod 64 and the base plate 61. A vertical mounting rod 65 is connected to each flat rod 64. A first screw 651 and a second screw 652 are threaded onto each vertical mounting rod 65. The first screw 651 is vertically positioned, and the second screw 652 is horizontally positioned. A pressure plate 66 is connected between two vertical mounting rods 65. The pressure plate 66 is pressed onto the precast box girder 8 by the vertical mounting rods 65 via a first screw 651, with the bottom surface of the pressure plate 66 abutting against the top surface of the precast box girder 8. A second screw 652 passes through one end of the vertical mounting rod 65 and is rotatably connected to a mounting pad. The mounting pad is used to contact the side of the precast box girder 8 to ensure its stability. Each vertical mounting rod 65 is connected to a first lifting ring 67. One first lifting ring 67 is connected to a first lifting rope 41, and the other first lifting ring 67 is connected to a second lifting rope 42. Two supporting diagonal rods 62 facilitate support for the precast box girder 8, while reinforcing diagonal rods 631 and reinforcing vertical rods 63 facilitate reinforcement of the supporting diagonal rods 62, reducing the possibility of deformation. The first lifting rings 67 facilitate connection to the first lifting rope 41 and the second lifting rope 42.

[0048] It should be noted that the protective frame 6 can be formed by splicing I-beams. Rubber pads are installed on the parts of the supporting diagonal brace 62 and pressure plate 66 that contact the precast box girder 8 to reduce the possibility of damage to the precast box girder 8.

[0049] In addition, a second lifting ring 661 is connected to the pressure plate 66, and a lowering winch 7 is installed on the ground. The lowering winch 7 is connected to a lowering rope, and the end of the lowering rope away from the lowering winch 7 passes through the second lifting ring 661 and connects to the first lifting ring 67. After the precast box girder 8 is installed, the connection between the pressure plate 66 and the vertical installation rod 65 is first released, and the pressure plate 66 is placed on the precast box girder 8. Then, the lowering rope passes through the second lifting ring 661 and connects to the first lifting ring 67. Then, the bottom plate 61 and the reinforcing diagonal rod 631 are lowered by the lowering winch 7. After being lowered to the ground, the lowering rope is collected. Then, the first lifting rope 41 and the second lifting rope 42 are connected to the second lifting ring 661, and the pressure plate 66 is hoisted to the ground.

[0050] Secondly, this application provides a construction method.

[0051] A construction method, based on the aforementioned beam-lifting platform with automatic leveling function, includes the following steps: S1. Connect the first lifting rope 41 and the second lifting rope 42 of each group of lifting beams 4 to the precast box girder 8; S2. The precast box girder 8 is lifted into the air using the hoisting device 3; S3, the first tilt sensor and the second tilt sensor monitor the attitude of the precast box girder 8 and send electrical signals to the hoisting device 3 and the adjustment assembly 5; S4. The hoisting device 3 and the adjustment component 5 adjust the posture of the precast box girder 8 until the precast box girder 8 is leveled. S4. The hoisting device 3 lowers the precast box girder 8 onto the bridge pier.

[0052] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Identical components are represented by the same reference numerals. Therefore, all equivalent changes made to the structure, shape, and principle of this application should be covered within the scope of protection of this application.

Claims

1. A beam-lifting platform with automatic leveling function, characterized in that, It includes two sets of support brackets (1) and mounting brackets (2). Each set of support brackets (1) has two brackets and is installed on the ground on both sides of the bridge pier. Each set of mounting brackets (2) is installed on the two support brackets (1). Each mounting bracket (2) is connected to a hoisting device (3). The movable end of each hoisting device (3) is connected to a lifting beam (4). Each lifting beam (4) is provided with a first lifting rope (41) and a second lifting rope (42) for connecting to the precast box girder (8). Each set of first lifting ropes (41) and second lifting ropes (42) is connected to both sides of the precast box girder (8). The precast box girder (8) is provided with a first tilt sensor and a second tilt sensor. The first tilt sensor is electrically connected to the two sets of hoisting devices (3). Each lifting beam (4) is provided with an adjustment component (5) for adjusting the extension length of the first lifting rope (41) and the second lifting rope (42). The two sets of adjustment components (5) are electrically connected to the second tilt sensor.

2. The beam lifting platform with automatic leveling function according to claim 1, characterized in that: The hoisting device (3) includes a traveling frame and a hoisting winch. The traveling frame is mounted on the mounting bracket (2) via a traveling assembly. The hoisting winch is connected to the hoisting beam (4) via a sling (31). The hoisting winch is electrically connected to the first tilt sensor.

3. A beam-lifting platform with automatic leveling function according to claim 2, characterized in that: The adjustment assembly (5) includes a balance bar (51) and a first hydraulic cylinder (52). The balance bar (51) is rotatably connected to the middle position of the lifting beam (4). One end of the balance bar (51) is connected to the first lifting rope (41), and the other end is connected to the second lifting rope (42). The first hydraulic cylinder (52) is installed on the inner wall of the lifting beam (4). The piston rod of the first hydraulic cylinder (52) abuts against the side wall of the balance bar (51) to drive the balance bar (51) to rotate.

4. A beam-lifting platform with automatic leveling function according to claim 3, characterized in that: The adjustment assembly (5) also includes a second hydraulic cylinder (53), which is installed on the inner wall of the lifting beam (4). The piston rod of the second hydraulic cylinder (53) abuts against the side wall of the balance bar (51). The first hydraulic cylinder (52) and the second hydraulic cylinder (53) are located on both sides of the balance bar (51) and the rotating shaft of the lifting beam (4).

5. A beam-lifting platform with automatic leveling function according to claim 4, characterized in that: A micro hydraulic pump (54) is also installed inside the lifting beam (4). The input end of the micro hydraulic pump (54) is connected to an oil tank (55). The output end of the micro hydraulic pump (54) is connected to a first hydraulic cylinder (52). The first hydraulic cylinder (52) is connected to a second hydraulic cylinder (53) so that when the piston rod of the first hydraulic cylinder (52) extends, the piston rod of the second hydraulic cylinder (53) retracts, or when the piston rod of the second hydraulic cylinder (53) extends, the piston rod of the first hydraulic cylinder (52) retracts. A control component is provided between the micro hydraulic pump (54) and the first hydraulic cylinder (52) and the second hydraulic cylinder (53). The control component is electrically connected to a second tilt sensor.

6. A beam-lifting platform with automatic leveling function according to claim 5, characterized in that: The lifting beam (4) is rotatably connected to a first guide wheel (43) and a second guide wheel (44). The first guide wheel (43) and the second guide wheel (44) are located at both ends of the lifting beam (4). The first lifting rope (41) passes around the first guide wheel (43), and the second lifting rope (42) passes around the second guide wheel (44).

7. A beam-lifting platform with automatic leveling function according to claim 1, characterized in that: The precast box girder (8) is covered with a protective frame (6), which is connected to the first suspension rope (41) and the second suspension rope (42).

8. A beam-lifting platform with automatic leveling function according to claim 7, characterized in that: The protective frame (6) includes a base plate (61), on which two supporting diagonal rods (62) are provided. Between the two supporting diagonal rods (62) is a receiving area for accommodating the precast box girder (8). When the precast box girder (8) is located in the receiving area, the precast box girder (8) is in contact with the two supporting diagonal rods (62) and has a gap with the base plate (61). A reinforcing vertical rod (63) is connected between the base plate (61) and each supporting diagonal rod (62). A planar rod (64) is connected to one end of each supporting diagonal rod (62) away from the base plate (61). A reinforcing diagonal rod (631) is connected between each planar rod (64) and the base plate (61). Each of the planar rods (64) is connected to a vertical mounting rod (65), and a pressure plate (66) is connected between two of the vertical mounting rods (65). The pressure plate (66) abuts against the top surface of the precast box girder (8). Each of the vertical mounting rods (65) is connected to a first lifting ring (67). One first lifting ring (67) is connected to a first lifting rope (41), and the other first lifting ring (67) is connected to a second lifting rope (42).

9. A beam-lifting platform with automatic leveling function according to claim 8, characterized in that: The pressure plate (66) is connected to a second lifting ring (661), and a lowering winch (7) is installed on the ground. The lowering winch (7) is connected to a lowering rope. The end of the lowering rope away from the lowering winch (7) passes through the second lifting ring (661) and is connected to the first lifting ring (67).

10. A construction method, based on the beam-lifting platform with automatic leveling function as described in any one of claims 1-9, characterized in that: Includes the following steps: S1. Connect the first lifting rope (41) and the second lifting rope (42) of each set of lifting beams (4) to the precast box girder (8); S2. The precast box girder (8) is lifted into the air by the hoisting device (3); S3, the first tilt sensor and the second tilt sensor monitor the attitude of the precast box girder (8) and send electrical signals to the hoisting device (3) and the adjustment assembly (5); S4. The hoisting device (3) and the adjustment component (5) adjust the posture of the precast box girder (8) until the precast box girder (8) is leveled. S4. The hoisting device (3) lowers the precast box girder (8) onto the bridge pier.

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