A bridge erecting machine for precast beam lifting construction and a construction method

Abstract

The application relates to the technical field of bridge erecting machines, and particularly discloses a bridge erecting machine for precast beam lifting construction and a construction method, which comprises a truss and a crown block assembly, the truss is fixed with a sliding track, the crown block assembly moves longitudinally along the sliding track, the crown block assembly is provided with two groups, each of the two groups of crown block assemblies is provided with a lifting mechanism and a stabilizing assembly, the stabilizing assembly is arranged below the crown block assembly and between the trusses, the stabilizing assembly is slidably connected with the crown block assembly, and the stabilizing assembly is kept stable without shaking under the limitation of the crown block assembly; when the precast beam is installed, the two groups of stabilizing assemblies are connected with the front and rear ends of the precast beam respectively, the stabilizing assembly and the precast beam are lifted through the lifting mechanism, the precast beam moves synchronously with the stabilizing assembly, and the stabilizing assembly limits the precast beam during the moving and installing process of the precast beam, so that the precast beam is prevented from shaking.

Description

Technical Field

[0001] This invention relates to the field of bridge erecting machine technology, specifically to a bridge erecting machine and construction method for lifting precast beams. Background Technology

[0002] With the development of three-dimensional road networks, bridges spanning railways, highways, waterways, urban interchanges, and important pipelines are becoming increasingly common. The bridge construction method of using precast beams in factories and erecting them on-site with bridge erecting machines is becoming an inevitable trend. Bridge erecting machines, as large-scale special equipment in construction, have become indispensable key equipment in highway bridge construction. In existing technology, bridge erecting machines consist of trusses and overhead cranes. When installing precast beams, the bridge erecting machine is mounted on the piers via outriggers. The hoist on the overhead crane lifts the precast beam, and the overhead crane slides on the truss, moving the precast beam to the installation position for installation.

[0003] Chinese patent application CN115057337A discloses a bridge erecting machine pier front support transport device, comprising a main body having a support portion for being disposed between the pier top block and the pier body, and further comprising: a first wheel frame rotatably mounted on the main body; a first wheel body rotatably mounted on the first wheel frame; a first linear drive device, one end of which is hinged to the main body, and the other end of which is hinged to the middle of the first wheel frame, the first linear drive device driving the first wheel frame to swing along the hinge point, for driving the first wheel body to contact or disengage from the top of the pier body, the first wheel body supporting one end of the main body; and a first lifting lug. On the main body, the first lifting lug is located on one side of the support portion; the second lifting lug is movably disposed on the main body, located on the side of the first lifting lug closer to the support portion, and the second lifting lug can move closer to or away from the first lifting lug; the second wheel frame is hinged at one end to the main body, and the second wheel frame is located between the first wheel frame and the support portion; the second wheel body is rotatably disposed on the second wheel frame, and the second wheel body is located at the other end of the second wheel frame; the second linear drive device is hinged at one end to the main body, and the other end of the second linear drive device is hinged to the middle of the second wheel frame, for driving the second wheel body to contact or disengage from the bottom of the pier top block.

[0004] In the aforementioned technologies, the overhead crane on the bridge erecting machine will sway in the air when the precast beam is lifted and transported to the installation position during the lifting and transportation of the precast bridge, which increases the construction risk. Especially during the bridge segment splicing process, any slight sway may cause the segment to shift, affecting the splicing accuracy. Summary of the Invention

[0005] This invention provides a bridge erecting machine and construction method for lifting precast beams, aiming to solve the problems of swaying and cumbersome installation methods in related technologies during the installation of precast beams.

[0006] In a first aspect, the present invention provides a bridge erecting machine for lifting precast beams, comprising a gantry frame, a crossbeam, and a lifting mechanism. The gantry frame is slidably engaged with a truss. The lifting mechanism is mounted on the gantry frame. The machine also includes a stabilizing component and a fixing component. The stabilizing component includes a limiting column and a stabilizing frame. The limiting column passes through the crossbeam and is vertically slidably engaged with the crossbeam. The stabilizing frame is fixed to the lower end of the limiting column and is used to connect the precast beam. The lifting mechanism is drively connected to the stabilizing frame and is used to drive the stabilizing frame and the limiting column to move vertically. The fixing component includes an adjusting component, an abutment head, and a pressure plate. The adjusting component is mounted on the gantry frame. The abutment head is located at the bottom end of the adjusting component. The adjusting component is used to drive the abutment head to slide vertically. The pressure plate is fixedly connected to the limiting column and is located above the adjusting component.

[0007] The overhead crane frame drives the stabilizing frame to slide along the truss. The limiting column restricts the swaying of the precast beam. The stabilizing frame moves down, causing the pressure plate to squeeze the adjusting component. The adjusting component pushes the contact head to abut the truss, thereby limiting the overhead crane frame and fixing the overhead crane frame and the truss relatively.

[0008] Its effects are as follows: the overhead crane frame moves the lifting mechanism and stabilizing components above the precast beam. The lifting mechanism lowers the stabilizing frame, and the limiting column and the crossbeam slide together to form a rigid vertical limit on the stabilizing frame. The stabilizing frame moves smoothly downward and then connects to the precast beam. After the connection is completed, the lifting mechanism smoothly lifts the stabilizing frame and the precast beam upward, so that the precast beam is separated from the transport vehicle. The control system controls the overhead crane frame to move the stabilizing frame and the precast beam smoothly horizontally to the installation position. During the lowering and installation process, the limiting column moves downward, pushing the adjusting component downward until the contact head abuts against the truss, fixing the overhead crane frame. This effectively suppresses the shaking during the installation of the precast beam, avoids the displacement of bridge segment splicing, greatly reduces construction risks, and improves splicing accuracy.

[0009] Preferably, the stabilizing component also includes a positioning column and a top plate. The positioning column is located below the stabilizing frame, and a fixing groove is provided at the end of the positioning column away from the stabilizing frame. The top plate is provided with a fixing shaft that matches the fixing groove. The precast beam is provided with a reserved hole corresponding to the positioning column. When the stabilizing frame is connected to the precast beam, the positioning column passes through the reserved hole, and the fixing shaft is embedded in the fixing groove, so that the stabilizing frame and the precast beam are connected.

[0010] Its effect is that the positioning column passes through the reserved hole, the top plate is installed from inside the precast beam, and the fixing shaft on the top plate is embedded into the fixing groove on the positioning column to complete the fixing, which simplifies the precast beam connection process and improves construction efficiency.

[0011] Preferably, the adjusting component includes a spring and an elastic telescopic rod. The elastic telescopic rod is mounted on the overhead crane frame and is vertically and slidably connected to the overhead crane frame and the crossbeam. The elastic telescopic rod passes through the overhead crane frame and the crossbeam and extends to the outside of the crossbeam. One end of the spring is connected to the elastic telescopic rod, and the other end is connected to the overhead crane frame. The elastic coefficient of the elastic telescopic rod is greater than that of the spring. When the pressure plate presses down on the elastic telescopic rod, the elastic telescopic rod overcomes the elastic force of the spring and drives the contact head to move down.

[0012] Preferably, the stabilizer frame has a T-shaped groove along the left and right direction, and the upper part of the positioning column is configured as a T-shaped block that matches the T-shaped groove.

[0013] Preferably, there are two positioning columns and two driving components on the stabilizing frame. The two driving components are fixed at the left and right ends of the stabilizing frame, and one end of the driving component is fixedly connected to the positioning column. The driving component is used to control the left and right sliding of the positioning column.

[0014] Its effect is as follows: When installing precast beams of different widths, the distance between two adjacent reserved holes is different. The driving component makes the positioning column move away from or closer to each other in the left and right directions to adapt to the reserved holes in different positions. When installing precast beams, especially when the precast beam is about to be installed in the preset position, there will be a deviation between the precast beam and the preset position. The driving component makes the positioning column move the precast beam left and right to make fine adjustment of the position and make the precast beam accurately installed in the preset position.

[0015] Preferably, the diameter of the positioning post is smaller than the diameter of the reserved hole.

[0016] Its effect is that the diameter of the positioning post is smaller than the diameter of the reserved hole, so as to adapt to reserved holes of different diameters. Even when the positioning post and the reserved hole are not on the same axis and there is a slight deviation, it can still ensure that the positioning post extends into the reserved hole.

[0017] Preferably, the stabilizing component further includes a limiting plug, which is cylindrical and is divided into two parts along the axial direction. When the two parts are combined, the interior of the limiting plug is a through groove adapted to the positioning post. The limiting plug is sleeved on the positioning post for fixing the top plate and is embedded in the reserved hole to fill the gap between the reserved hole and the positioning post.

[0018] Preferably, the limiting plug is made of rubber, and the diameter of the upper part of the limiting plug gradually decreases along the vertical upward direction.

[0019] Its effect is that after the top plate is installed, the limiting plug is then attached to the positioning post to fix the top plate and the positioning post together. Furthermore, after the limiting plug is pulled into the reserved hole, the limiting plug limits the positioning post.

[0020] Preferably, the lifting mechanism includes a lifting motor, a winding wheel, and a wire rope. The lifting motor is fixed on the overhead crane frame, the winding wheel is located directly above the stabilizer frame and is rotatably connected to the overhead crane frame, the output end of the lifting motor is connected to the winding wheel, the wire rope is wound on the winding wheel, and the extended end of the wire rope is connected to the stabilizer frame.

[0021] Secondly, the present invention provides a method for lifting and constructing a precast beam, which, according to the aforementioned bridge erecting machine for lifting and constructing a precast beam, includes the following steps:

[0022] S1. The transport vehicle transports the precast beam to the bottom of the bridge erecting machine and controls the gantry crane to move back and forth along the truss so that the two sets of gantry cranes move to the front and rear ends of the precast beam respectively.

[0023] S2. Control the lifting mechanism to drive the stabilizing frame to move downward. Under the vertical limiting action of the limiting column, the stabilizing frame descends smoothly to the precast beam connection position to avoid the precast beam swaying. Simultaneously, the contact head is driven by the pressure plate to abut against the truss to complete the fixation of the overhead crane frame.

[0024] S3. Connect the stabilizer to the precast beam;

[0025] S4. The lifting mechanism reverses its operation, driving the stabilizer and precast beam upwards until they are separated from the transport vehicle.

[0026] S5. Control the overhead crane to transport the precast beam to the installation position;

[0027] S6. After the overhead crane frame moves above the installation position, it stops. The lifting mechanism lowers the stabilizing frame, which drives the precast beam close to the pier and into place at the preset installation location.

[0028] Its effects are as follows: When the gantry crane moves along the truss to the top of the precast beam, the fixing components secure the gantry crane as the stabilizing frame descends to connect with the precast beam, ensuring a smooth connection. As the gantry crane moves the stabilizing frame and the precast beam to the installation position, the stabilizing frame maintains stable and rapid movement under the rigid constraint of the vertical direction of the crossbeam, improving installation efficiency and preventing swaying of the gantry crane at high speeds, which would increase construction risks. After moving to the installation position, the lifting mechanism moves the stabilizing frame and the precast beam towards the pier. During the movement towards the pier, the adjusting components secure the gantry crane to prevent swaying of the precast beam when it is installed on the pier, which could cause the precast beam to shift in its installation position.

[0029] By adopting the above technical solution, the beneficial effects of the present invention are as follows:

[0030] 1. During the installation of precast beams onto bridge piers using a bridge erecting machine, the limiting column and the crossbeam slide together to form a rigid vertical limit on the stabilizing frame, ensuring that the gantry crane does not sway as it moves the precast beam. By pressing the elastic telescopic rod downwards, the contact head abuts against the sliding track, ensuring that the stabilizing frame remains stable and does not sway when lowering the precast beam. Furthermore, the closer the precast beam is to the bridge pier, the greater the pressure of the contact head against the sliding track, preventing swaying of the precast beam during fine-tuning, avoiding displacement of bridge segment splicing, significantly reducing construction risks, and improving splicing accuracy.

[0031] 2. The positioning column is moved by the drive component, thereby adjusting the distance between the two positioning columns to fit the reserved holes at different positions. When connecting the stabilizer to the precast beam, the positioning column passes through the reserved hole, and the top plate is inserted from inside the precast beam, so that the fixed shaft on the top plate is embedded in the fixed groove, completing the connection between the precast beam and the stabilizer. This simplifies the precast beam connection process and eliminates the need for complex threaded installation. Furthermore, the drive component drives the precast beam to move left and right through the positioning column, finely adjusting the position of the precast beam in the left and right directions, so that the precast beam is accurately installed in the preset position. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of the bridge erecting machine of the present invention.

[0033] Figure 2 This is a schematic diagram of the stable component structure of the present invention.

[0034] Figure 3 This is a top view of the overhead crane assembly of the present invention.

[0035] Figure 4 This is a schematic diagram of the precast beam connection of the present invention.

[0036] Figure 5 This is a schematic cross-sectional view of the left side of the stabilizer frame of the present invention.

[0037] Figure 6 This is a schematic diagram of the explosion structure of the limiting plug of the present invention.

[0038] Figure 7 This is a schematic diagram of the positioning column structure of the present invention.

[0039] Figure 8 For the present invention Figure 4 Enlarged diagram of point A in the middle.

[0040] Figure 9 This is a schematic diagram of the fixed component structure of the present invention.

[0041] Figure 10 This is a front view schematic diagram of the stabilizing component of the present invention.

[0042] Figure label:

[0043] 1. Truss; 11. Sliding rail; 2. Crane assembly; 21. Crane frame; 22. Crossbeam; 23. Drive motor; 24. Drive wheel; 3. Lifting mechanism; 31. Lifting motor; 32. Winding wheel; 33. Wire rope; 4. Stabilizing assembly; 41. Limiting post; 42. Stabilizing frame; 421. Connecting part; 422. T-slot; 423. Driving component; 43. Positioning post; 431. Fixing slot; 44. Top plate; 45. Limiting plug; 5. Fixing assembly; 51. Adjusting component; 511. Spring; 512. Elastic telescopic rod; 52. Contact head; 53. Pressure plate; 6. Precast beam. Detailed Implementation

[0044] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0045] like Figures 1 to 10 As shown, a bridge erecting machine for lifting precast beams includes a truss 1 and a trolley assembly 2. There are two trusses 1, each connected to a support leg at its bottom, which supports the truss 1 on the bridge pier. The trolley assembly 2 moves longitudinally along the trusses 1 and has two sets. Each set of trolley assemblies 2 is equipped with a lifting mechanism 3 and a stabilizing component 4. The stabilizing component 4 is positioned below the trolley assembly 2 and between the two trusses 1. The stabilizing component 4 is connected to the lifting mechanism 3 and slides within the trolley assembly 2, thus maintaining a stable state under the limiting influence of the trolley assembly 2. When installing the precast beam 6, the two sets of stabilizing components 4 are connected to the front and rear ends of the precast beam 6, respectively. The lifting mechanism 3 lifts the stabilizing component 4 and the precast beam 6, allowing the precast beam 6 and the stabilizing component 4 to move synchronously. During the transport and installation of the precast beam 6, the trolley assembly 2 applies horizontal limiting constraints to the stabilizing component 4 and the precast beam 6 to prevent swaying of the precast beam 6.

[0046] like Figure 2 , Figure 4 , Figure 5 and Figure 10As shown, the stabilizing component 4 includes a limiting post 41, a stabilizing frame 42, a positioning post 43, and a top plate 44. The limiting post 41 passes through the overhead crane component 2 and slides vertically with it. The stabilizing frame 42 is fixed at the lower end of the limiting post 41 and is located directly below the lifting mechanism 3 and is connected to the lifting mechanism 3 via a transmission. The overhead crane component 2 restricts the horizontal displacement of the stabilizing frame 42 through the limiting post 41 to ensure that the stabilizing frame 42 remains stable during the transportation and installation of the precast beam 6. There are two positioning posts 43, which are respectively located on the left and right sides of the stabilizing frame 42. The precast beam 6 has reserved holes corresponding to the positioning posts 43. When the stabilizing frame 42 moves down, the positioning posts 43 simultaneously pass through the reserved holes. The top plate 44 fits against the inner top wall of the precast beam 6 and is connected to the positioning posts 43, thereby realizing the fixed connection between the stabilizing frame 42 and the precast beam 6.

[0047] When installing the precast beam 6, the transport vehicle transports the precast beam 6 to the area below the truss 1. Two sets of overhead crane components 2 move along the truss 1 to the front and rear ends of the precast beam 6. The lifting mechanism 3 on the overhead crane component 2 drives the stabilizing frame 42 to move downward. During this process, the overhead crane component 2 always limits the limiting column 41 in the vertical direction. After the positioning column 43 passes through the reserved hole, the stabilizing frame 42 stops moving downward and connects the top plate 44 from inside the precast beam 6 to the positioning column 43. The lifting mechanism 3 starts again, lifting the stabilizing frame 42 and the precast beam 6 upward, so that they are separated from the transport vehicle. The overhead crane component 2 starts and drives the precast beam 6 to the installation position through the stabilizing frame 42. During this process, the limiting column 41 limits the stabilizing frame 42 to prevent the stabilizing frame 42 and the precast beam 6 from shaking during transportation. After moving to the installation position, the overhead crane component 2 stops working, and the lifting mechanism 3 starts and drives the stabilizing frame 42 to move downward. The stabilizing frame 42 drives the precast beam 6 to move towards the pier, finally making the precast beam 6 stably installed.

[0048] like Figures 2 to 4As shown, the overhead crane assembly 2 includes a crane frame 21, a crossbeam 22, a drive motor 23, and drive wheels 24. Two sliding rails 11 are laid on the top of the truss 1, respectively located on the left and right sides of the truss 1. Multiple drive wheels 24 are provided and rotatably connected to the crane frame 21, with the drive wheels 24 rolling in cooperation with the sliding rails 11. Two crane frames 21 are provided, longitudinally positioned above the left and right sliding rails 11 respectively. The drive motor 23 is fixed to the side of the crane frame 21 and connected to one of the drive wheels 24, thereby driving the crane frame 21 to move. The crossbeam 22 is fixed between the two crane frames 21, securing the two crane frames 21 together. The crossbeam 22 is equipped with... There is a limiting groove for the limiting post 41 to pass through. The lifting mechanism 3 is set on one side of the crossbeam 22 and between the two sets of overhead crane frames 21. The lifting mechanism 3 includes a lifting motor 31, a winding wheel 32 and a wire rope 33. The lifting motor 31 is fixed on the overhead crane frame 21. The winding wheel 32 is rotatably connected between the two overhead crane frames 21 and is set directly above the stabilizer frame 42. The output shaft of the lifting motor 31 is connected to the winding wheel 32. The wire rope 33 is wound on the winding wheel 32. The extended end of the wire rope 33 is connected to the stabilizer frame 42. The lifting motor 31 drives the winding wheel 32 to rotate. The winding wheel 32 winds up and unwinds the wire rope 33, thereby lifting and lowering the stabilizer frame 42.

[0049] When installing the precast beam 6, the drive motor 23 is started by the control system. The drive motor 23 moves the overhead crane frame 21 through the drive wheel 24. The overhead crane frame 21 moves to one end of the precast beam 6. The lifting motor 31 starts and unwinds the winding wheel 32 to drive the stabilizing frame 42 down, so that the positioning column 43 can extend into and pass through the reserved hole to connect the precast beam 6. After the connection is completed, the lifting motor 31 rotates in the opposite direction to make the winding wheel 32 wind up, lifting the precast beam 6 upward and separating it from the transport vehicle. Then the drive motor 23 controls the overhead crane frame 21 and the precast beam 6 to move to the installation position. The lifting motor 31 starts again to lower the precast beam 6 to complete the installation.

[0050] like Figure 8 and Figure 9 As shown, the overhead crane assembly 2 is equipped with two sets of fixing components 5, which are respectively positioned directly above the sliding rail 11. The fixing components 5 include an adjusting member 51, an abutment head 52, and a pressure plate 53. The adjusting member 51 is mounted on the overhead crane frame 21, and the abutment head 52 is fixed to the bottom of the adjusting member 51. When the stabilizer frame 42 is lowered, the adjusting member 51 drives the abutment head 52 to abut against the sliding rail 11, thereby limiting the position of the overhead crane frame 21 and fixing the overhead crane frame 21 relative to the truss 1. This prevents the overhead crane frame 21 from shaking when connecting and installing the precast beam 6.

[0051] Adjusting component 51 includes an elastic telescopic rod 512 and a spring 511. The elastic telescopic rod 512 is slidably connected to the overhead crane frame 21 and the crossbeam 22 in the vertical direction. Its lower part extends downward to below the overhead crane frame 21, and its upper part extends upward to the outside of the crossbeam 22. The spring 511 is fitted onto the elastic telescopic rod 512. One end of the spring 511 is fixed to the inner bottom wall of the crossbeam 22, and the other end is fixedly connected to the elastic telescopic rod 512. The spring 511 is configured as a spring. An abutment head 52 is fixed to the bottom end of the elastic telescopic rod 512. The abutment head 52 is located directly above the sliding rail 11 and can abut against the sliding rail 11 when it moves downward. The elastic coefficient of the telescopic rod 512 is greater than that of the elastic element 511. Therefore, when the elastic telescopic rod 512 is pressed downward, the elastic element 511 is compressed first, causing the contact head 52 to abut against the sliding rail 11. The pressure plate 53 is set above the elastic telescopic rod 512 and fixed to the top of the limiting column 41. When the stabilizing frame 42 is lowered, it drives the pressure plate 53 to move downward, pushing the elastic telescopic rods 512 at both ends of the crossbeam 22 to move downward synchronously, so that the contact head 52 abuts against the sliding rail 11, thereby limiting the crane frame 21 and fixing the crane frame 21, effectively avoiding horizontal swaying during the connection and installation of the precast beam 6.

[0052] When installing the precast beam 6, the lifting motor 31 drives the stabilizing frame 42 to move downwards. The stabilizing frame 42 drives the limiting column 41 and the pressure plate 53 to move downwards. The pressure plate 53 presses down on the elastic telescopic rod 512, compressing it. This causes the elastic telescopic rod 512 to overcome the elastic force of the spring 511 and move downwards. As the elastic telescopic rod 512 moves downwards, it drives the contact head 52 to move downwards until it abuts against the sliding rail 11, fixing the overhead crane frame 21 to the truss 1. This prevents the overhead crane frame 21 from swaying during the connection and installation of the precast beam 6. When the contact head 52 abuts against the sliding rail 11, the stabilizing frame... As the 42 continues to move downwards, the elastic telescopic rod 512 is further compressed, and the pressure of the contact head 52 against the sliding rail 11 gradually increases, thereby gradually improving the stability coefficient of the overhead crane frame 21. Furthermore, the spring on the elastic telescopic rod 512 can be replaced, so that springs with different elastic coefficients can be replaced according to different working conditions. Especially in the case of a slope environment, a spring with a larger elastic coefficient is replaced, so that the contact head 52 abuts against the sliding rail 11 with greater force, thereby preventing the overhead crane frame 21 from moving relative to the truss 1. Furthermore, the contact head 52 is provided with locking teeth, and the sliding rail 11 is provided with matching locking grooves to further limit the position of the overhead crane frame 21.

[0053] like Figures 4 to 7As shown, the diameter of the positioning post 43 is smaller than the diameter of the reserved hole to accommodate reserved holes of different sizes. A fixing groove 431 is provided at the end of the positioning post 43 furthest from the stabilizer 42. After the positioning post 43 passes through the reserved hole on the precast beam 6, the fixing shafts at both ends of the top plate 44 are embedded into the fixing groove 431, thereby achieving rapid connection of the precast beam 6. The stabilizing assembly 4 also includes a limiting plug 45, which is cylindrical. The diameter of the upper part of the limiting plug 45 gradually decreases vertically upwards. The structure is divided into two parts along the axial direction, and the two parts are connected by a limiting plug 45. The limiting plug 45 is made of rubber to accommodate reserved holes of different diameters. After the top plate 44 is installed, the limiting plug 45 is snapped onto the positioning post 43 to limit the fixed shaft on the top plate 44. When the positioning post 43 is pulled upward, the top plate 44 is pressed tightly against the inner top wall of the precast beam 6, and the limiting plug 45 enters the reserved hole to fill the gap between the reserved hole and the positioning post 43, preventing the precast beam 6 from shaking due to the reserved hole being too large.

[0054] like Figure 2 , Figure 4 and Figure 5 As shown, a connector 421 is fixed on the side of the stabilizer 42 near the crossbeam 22. The limiting post 41 and the stabilizer 42 are fixedly connected by the connector 421. The connector 421 can be an L-shaped plate or a straight plate. A T-shaped groove 422 is provided inside the stabilizer 42. A T-shaped block that matches the T-shaped groove 422 is fixed on the upper end of the positioning post 43. Two driving components 423 are provided on the stabilizer 42. The two driving components 423 are fixed on the left and right sides of the stabilizer 42 respectively. The driving component 423 is a cylinder. The telescopic end of the cylinder passes through the stabilizer 42 and is fixedly connected to the T-shaped block.

[0055] When installing the precast beam 6, if the two positioning columns 43 deviate from the position of the reserved hole, the positioning columns 43 are synchronously driven to adjust, moving them away from or closer to each other. This adjusts the distance between the two positioning columns 43 to adapt to the position of the reserved hole and ensures that the two positioning columns 43 move away from or closer to each other by the same distance, preventing the center of gravity of the positioning columns 43 from shifting relative to the stabilizing frame 42 and causing damage to the equipment when lifting the precast beam 6. At the same time, when installing the precast beam 6 onto the pier, the two drive components 423 are activated simultaneously, causing the two positioning columns 43 to move in the same direction, making fine adjustments to the position of the precast beam 6 in the left and right directions, and installing the precast beam 6 into the preset position.

[0056] Working principle: When installing the precast beam 6, the transport vehicle first transports the precast beam 6 to the position directly below the truss 1. Then, the drive motor 23 is started to control the crane frame 21 to move. During this process, under the vertical limiting action of the crossbeam 22 on the limiting column 41, the stabilizing frame 42 maintains stable movement. The two sets of crane components 2 move along the sliding track 11 to the corresponding positions of the reserved holes at the front and rear ends of the precast beam 6.

[0057] The lifting motor 31 starts, and the winding wheel 32 unwinds the wire rope. The wire rope 33 drives the stabilizing frame 42 to move downward. The stabilizing frame 42 maintains a stable descent. When the positioning column 43 approaches the precast beam 6, the drive component 423 is activated to synchronously drive the positioning column 43, so that the two positioning columns 43 move away from or closer to each other, thereby adjusting the distance between the two positioning columns 43 to correspond to the position of the reserved hole. When the positioning column 43 is coaxial with the reserved hole on the precast beam 6 (a slight positional deviation from the reserved hole is allowed), the stabilizing frame 42 continues to descend so that the positioning column 43 passes through the reserved hole. At this time, the stabilizing frame 42 stops moving downward. The workers insert the fixing shafts at both ends of the top plate 44 into the fixing grooves 431 on the positioning column 43 to complete the initial connection between the precast beam 6 and the stabilizing frame 42. Then, the limiting plug 45 is snapped onto the positioning column 43 to complete the connection of the precast beam 6.

[0058] Next, the lifting motor 31 rotates in the opposite direction, and the winding wheel 32 winds up the wire rope 33, lifting the stabilizing frame 42 and the connected precast beam 6 upwards, so that they are separated from the transport vehicle. Then, the drive motor 23 starts, and drives the overhead crane frame 21 to move along the sliding track 11 through the drive wheel 24. The overhead crane frame 21 drives the stabilizing frame 42 and the precast beam 6 to move to the installation position through the wire rope 33. During the movement, the limiting column 41 remains horizontally stable under the vertical limit of the crossbeam 22, preventing the stabilizing frame 42 from shaking, thereby ensuring the stable transportation of the precast beam 6.

[0059] When the crane frame 21 moves above the installation position, it stops moving, the lifting motor 31 starts again, and drives the stabilizing frame 42 to move downward. The stabilizing frame 42 drives the precast beam 6 closer to the pier, and finally stabilizes the precast beam 6 in the preset position. During the descent of the stabilizing frame 42, the pressure plate 53 moves downward and squeezes the elastic telescopic rod 512. The elastic telescopic rod 512 is squeezed and overcomes the elastic force of the spring 511 to move downward. The contact head 52 abuts against the sliding rail 11 to limit the crane frame 21 and prevent the crane frame 21 from shaking when connecting and installing the precast beam 6.

[0060] When the precast beam 6 is installed onto the bridge pier, if it is necessary to make a fine adjustment to the position of the precast beam 6, the two drive components 423 are activated at the same time, so that the two positioning columns 43 move in the same direction, adjust the position of the precast beam 6 in the left and right directions, and install it precisely into the preset position.

[0061] In addition, the present invention also discloses a method for lifting precast beams, which uses the aforementioned bridge erecting machine for lifting precast beams.

[0062] A method for lifting precast beams includes the following steps:

[0063] S1. Transport the precast beam 6 to the truss 1 directly below it using a transport vehicle. Start the drive motor 23 to drive the overhead crane frame 21 to move along the sliding track 11 on the truss 1, so that the two sets of overhead crane components 2 are precisely aligned with the reserved holes at the front and rear ends of the precast beam 6.

[0064] S2. Start the lifting motor 31, and unwind the wire rope 33 through the winding wheel 32, driving the stabilizing frame 42 to move downward. Under the vertical limiting action of the crossbeam 22 on the limiting column 41, the stabilizing frame 42 descends smoothly. The driving component 423 starts to adjust the position of the positioning column 43 until the positioning column 43 is coaxial with the reserved hole. The stabilizing frame 42 continues to descend so that the positioning column 43 passes through the reserved hole on the precast beam 6. During the descent of the stabilizing frame 42, the pressure plate 53 at the top of the limiting column 41 squeezes the elastic telescopic rod 512. The elastic telescopic rod 512 overcomes the elastic force of the elastic element 511 and moves downward, so that the contact head 52 tightly abuts against the sliding rail 11 to fix the overhead crane frame 21.

[0065] S3. Workers enter the interior of the precast beam 6 and embed the fixed shafts at both ends of the top plate 44 into the fixed grooves 431 on the positioning column 43 to complete the initial connection; then the limiting plug 45 is snapped onto the positioning column 43 to limit the fixed shafts and fill the gap between the reserved hole and the positioning column 43 to prevent shaking.

[0066] S4. The lifting motor 31 rotates in the opposite direction, and the winding wheel 32 winds up the steel wire rope 33, lifting the stabilizer 42 and the connected precast beam 6 upward until they are completely separated from the transport vehicle, and the contact head 52 releases the restriction on the overhead crane frame 21.

[0067] S5, drive motor 23 starts again, driving the overhead crane frame 21 to move along the sliding track 11, and transporting the precast beam 6 to the pier installation position through wire rope 33 and stabilizer frame 42. During the transportation process, the limit column 41 continuously limits the movement to prevent the precast beam 6 from shaking.

[0068] S6. After the overhead crane frame 21 moves above the installation position, it stops. The lifting motor 31 starts and lowers the stabilizing frame 42, which drives the precast beam 6 closer to the pier. If the position needs to be fine-tuned, the drive component 423 is started to drive the two positioning columns 43 to move synchronously in the same direction, so as to fine-tune the left and right positions of the precast beam 6, and finally stabilize the precast beam 6 in the preset position.

[0069] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A bridge erecting machine for lifting precast beams during construction, comprising a gantry frame, a crossbeam, and a lifting mechanism, wherein the gantry frame is slidably fitted with a truss, and the lifting mechanism is mounted on the gantry frame, characterized in that, It also includes a stabilizing component and a fixing component. The stabilizing component includes a limiting column and a stabilizing frame. The limiting column passes through the crossbeam and slides vertically with the crossbeam. The stabilizing frame is fixed to the lower end of the limiting column and is used to connect the precast beam. The lifting mechanism is connected to the stabilizing frame and is used to drive the stabilizing frame and the limiting column to move vertically. The fixing component includes an adjusting component, a contact head and a pressure plate. The adjusting component is set on the crane frame. The contact head is set at the bottom end of the adjusting component. The adjusting component is used to drive the contact head to slide vertically. The pressure plate is fixedly connected to the limiting column and is set above the adjusting component. The overhead crane frame drives the stabilizing frame to slide along the truss. The limiting column restricts the swaying of the precast beam. The stabilizing frame moves down and causes the pressure plate to squeeze the adjusting component. The adjusting component pushes the contact head to abut the truss, thereby limiting the overhead crane frame and fixing the overhead crane frame and the truss relatively. The stabilizing assembly also includes a positioning column and a top plate. The positioning column is located below the stabilizing frame. The end of the positioning column away from the stabilizing frame is provided with a fixing groove. The top plate is provided with a fixing shaft that matches the fixing groove. The precast beam is provided with a reserved hole corresponding to the positioning column. When the stabilizing frame is connected to the precast beam, the positioning column passes through the reserved hole and the fixing shaft is embedded in the fixing groove, so that the stabilizing frame and the precast beam are connected. The adjusting component includes a spring and an elastic telescopic rod. The elastic telescopic rod is mounted on the overhead crane frame and is vertically and slidably connected to the overhead crane frame and the crossbeam. The elastic telescopic rod passes through the overhead crane frame and the crossbeam and extends to the outside of the crossbeam. One end of the spring is connected to the elastic telescopic rod, and the other end is connected to the overhead crane frame. The elastic coefficient of the elastic telescopic rod is greater than that of the spring. When the pressure plate presses down on the elastic telescopic rod, the elastic telescopic rod overcomes the elastic force of the spring and drives the contact head to move down.

2. The bridge erecting machine for precast beam lifting construction according to claim 1, characterized in that, The stabilizer frame has a T-shaped groove along the left and right direction, and the upper part of the positioning column is set with a T-shaped block that fits the T-shaped groove.

3. The bridge erecting machine for precast beam lifting construction according to claim 2, characterized in that, There are two positioning columns and two driving components on the stabilizing frame. The two driving components are fixed at the left and right ends of the stabilizing frame. One end of the driving component is fixedly connected to the positioning column, and the driving component is used to control the left and right sliding of the positioning column.

4. The bridge erecting machine for precast beam lifting construction according to claim 2, characterized in that, The diameter of the positioning post is smaller than the diameter of the reserved hole.

5. The bridge erecting machine for precast beam lifting construction according to claim 4, characterized in that, The stabilizing component also includes a limiting plug, which is cylindrical and is divided into two parts along the axial direction. When the two parts are combined, the inside of the limiting plug is a through groove that is adapted to the positioning post. The limiting plug is sleeved on the positioning post to fix the top plate and is embedded in the reserved hole to fill the gap between the reserved hole and the positioning post.

6. The bridge erecting machine for precast beam lifting construction according to claim 5, characterized in that, The limiting plug is made of rubber, and the diameter of the upper part of the limiting plug gradually decreases along the vertical upward direction.

7. The bridge erecting machine for precast beam lifting construction according to claim 1, characterized in that, The lifting mechanism includes a lifting motor, a winding wheel, and a wire rope. The lifting motor is fixed on the overhead crane frame, the winding wheel is located directly above the stabilizing frame and is rotatably connected to the overhead crane frame, the output end of the lifting motor is connected to the winding wheel, the wire rope is wound on the winding wheel, and the extended end of the wire rope is connected to the stabilizing frame.

8. A method for lifting and constructing precast beams, comprising a bridge erecting machine for lifting and constructing precast beams according to any one of claims 1-7, characterized in that, Includes the following steps: S1. The transport vehicle transports the precast beam to the bottom of the bridge erecting machine and controls the gantry crane to move back and forth along the truss so that the two sets of gantry cranes move to the front and rear ends of the precast beam respectively. S2. Control the lifting mechanism to drive the stabilizing frame to move downward. Under the vertical limiting action of the limiting column, the stabilizing frame descends smoothly to the precast beam connection position to avoid the precast beam swaying. Simultaneously, the contact head is driven by the pressure plate to abut against the truss to complete the fixation of the overhead crane frame. S3. Connect the stabilizer to the precast beam; S4. The lifting mechanism reverses its operation, driving the stabilizer and precast beam upwards until they are separated from the transport vehicle. S5. Control the overhead crane to transport the precast beam to the installation position; S6. After the overhead crane frame moves above the installation position, it stops. The lifting mechanism lowers the stabilizing frame, which drives the precast beam close to the pier and into place at the preset installation location.

Images