Construction method of bridge girder erection machine at height-limited position

Abstract

The invention belongs to the technical field of bridge girder erection machines, and particularly relates to a construction method of a bridge girder erection machine at a height-limited position. Comprising the following steps: S1, arranging at least two hydraulic brackets for supporting a bridge girder erection machine on a girder transporting vehicle; s2, the bridge girder erection machine is lifted and transported to the height-limited position by the girder transporting vehicle from a high position, and the bridge girder erection machine passes through the height-limited position after being lowered to a low position; s3, enabling the front supporting leg structure to be stably supported on the bridge pier after passing through the height-limited position; s4, the tail of the bridge girder erection machine is still located at the height-limited position at the stage, the bridge girder erection machine advances forwards on the girder transporting vehicle, and the front supporting leg structure and the auxiliary supporting leg structure are erected on the corresponding piers in front at the same time; s5, synchronous jacking operation is carried out on the bridge erecting machine by means of the auxiliary supporting leg structure and the rear hydraulic bracket, so that the main beam of the bridge erecting machine is restored to the normal high position; and S6, the rear supporting leg structure is operated, and the upper curved beam, the upper door beam and the lower curved beam are folded to original positions. According to the invention, the problem of transportation contour limitation of traditional equipment during transition in narrow spaces such as a tunnel is successfully solved.

Description

Technical Field

[0001] This invention belongs to the field of bridge erecting machine technology, specifically a construction method for bridge erecting machines in height-restricted locations. Background Technology

[0002] In bridge construction, the method of transferring bridge erecting machines is just as important as the method of beam erection, directly determining the continuity of the construction route and overall efficiency. Traditional bridge erecting machines have significant problems with their construction organization methods when traversing tunnels, under bridges, or other areas with limited height and width, becoming a key bottleneck restricting the rapid progress of large-scale engineering projects.

[0003] Currently, the commonly used relocation method in the industry can be summarized as the "on-site dismantling and segmented transportation method." This method involves a fixed, labor-intensive process sequence: After the bridge erecting machine is positioned in front of the obstacle entrance, construction personnel need to systematically disassemble the main beam connecting bolts, outrigger anchors, hydraulic pipelines, and electrical wiring on site. This process often requires the assistance of large hoisting equipment to break down the entire machine into multiple units of dimensions and weights that meet transportation requirements.

[0004] The disassembled components are transported in batches through the narrow area using flatbed trucks and other means of transport. This logistics organization process not only consumes a large amount of transportation resources, but also requires clearing and controlling the transportation routes, making coordination work complex.

[0005] After all components are transported to the other side of the obstacle, they need to be reassembled, connected, leveled, and the system debugged on the new piers or bridge deck. This stage involves high-altitude operations, precision alignment, and load testing, making it a highly concentrated area of ​​safety and quality risks.

[0006] Therefore, from the perspective of construction methodology, there is an urgent need in this field to develop a novel "low-profile folding integral passage method." The ideal new method should strive to achieve the following goals: the bridge erecting machine can function as a complete, intelligent system, through the controllable deformation and coordinated movements of its own structure, to safely pass through confined spaces in a low profile without stopping the machine or disassembling it, and to quickly return to its working state after being in place. Summary of the Invention

[0007] In order to solve the above problems, the present invention provides a construction method for a bridge erecting machine in places with limited height.

[0008] This invention adopts the following technical solution: a construction method for a bridge erecting machine in height-restricted locations, comprising the following steps: S1: At least two hydraulic brackets are installed on the beam transport vehicle to support the bridge erecting machine. The rear outrigger structure of the bridge erecting machine is installed on the beam transport vehicle and can move along the beam transport vehicle. The front outrigger structure and auxiliary outrigger structure of the bridge erecting machine are located in front of the beam transport vehicle. S2: The beam transport vehicle lifts the bridge erecting machine to a height-restricted location, lowers the bridge erecting machine to a low position, and then passes through the height-restricted location; S3: When passing through a height-restricted area, the front outrigger structure is securely supported on the pier; S4: At this stage, the rear of the bridge erecting machine is still in a height-restricted area. The bridge erecting machine moves forward on the beam transport vehicle and simultaneously erects the front outrigger structure and the auxiliary outrigger structure on the corresponding pier in front. S5: Using the auxiliary support leg structure and the rear hydraulic bracket, the bridge erecting machine is synchronously lifted to restore the main beam of the bridge erecting machine to its normal height. S6: Operate the rear support leg structure by folding the upper curved beam, upper door beam, and lower curved beam back to their original positions.

[0009] In some embodiments, step S2, lowering the bridge erecting machine to a low position, specifically includes: Multiple hydraulic brackets are erected at the bottom of the main beam of the bridge erecting machine. The hydraulic brackets retract synchronously, so that the main beam of the bridge erecting machine can be smoothly lowered from a high position to a low position. Perform a folding operation on the front outrigger structure and the auxiliary outrigger structure: The front outrigger structure is folded and flipped toward the main beam using an electric hoist. The auxiliary outrigger structure retracts by driving the tilting cylinder assembly, causing the auxiliary outrigger steel frame to tilt upwards around the hinge point; Perform a folding operation on the rear outrigger structure: Operate the hydraulic cylinder to drive the upper door beam to fold; The upper and lower curved beams are folded relative to the main beam by operating an electric hoist. The bridge erecting machine is supported only by hydraulic brackets, and the entire bridge erecting machine is lowered by lowering the hydraulic brackets.

[0010] In some embodiments, step S4 includes: The front outrigger structure and the auxiliary outrigger structure are folded back to the vertical position, with the front outrigger structure supported on the corresponding pier and the auxiliary outrigger structure suspended in the air. After the operation, the lower curved beam in the outrigger structure folds back to its original position, and the bridge erecting machine is supported by the lower curved beam, the lower curved beam base, and the lower curved beam base transport trolley. Disconnect the hydraulic bracket from the bridge erecting machine. The lower curved beam base transport trolley of the rear support leg structure drives the main beam and auxiliary support leg structure to move forward. The front support leg structure slides relative to the main beam to maintain its own position. After the auxiliary outrigger structure is moved forward to the corresponding pier position, the auxiliary outrigger structure is operated to support itself on the pier.

[0011] In some embodiments, after step S6, the method further includes: The rear outrigger structure is lifted, the hydraulic bracket detaches from the main beam, the beam transport vehicle returns to the beam yard to load the beam, and the bridge erecting machine completes the operation.

[0012] In some embodiments, the bridge erecting machine includes: The main beam is horizontally positioned. The rear support leg structure is installed on the main beam structure to support the movement of the main beam. A front support leg structure is slidably mounted on the front end of the main beam. The front support leg structure can be folded around the connection position to support the main beam. An auxiliary support leg structure is hinged to the front end of the main beam. The auxiliary support leg structure can be adjusted in angle or folded around the hinge point to support the main beam.

[0013] In some embodiments, the rear outrigger structure includes: The upper curved beam is connected to the main beam via a folding hinge seat, allowing it to fold relative to the main beam. The upper door beam is hinged to the upper curved beam and can be rotated and folded by the upper door beam folding cylinder. One end of the upper door beam folding cylinder is connected to the upper curved beam, and the other end is connected to the upper door beam folding hinge seat fixed on the main beam. The lower curved beam is connected to the bottom of the upper curved beam via a lower curved beam folding hinge seat, and can be folded relative to the upper curved beam; Lower curved beam base, wherein the lower curved beam base is installed at the bottom of the lower curved beam; The lower curved beam base transport trolley is located at the bottom of the lower curved beam base.

[0014] In some embodiments, the front outrigger structure includes: The main beam rear support is provided in two sets, both of which can move along the guide rails provided at the bottom of the main beam. The upper slide rail support beam is connected between the two sets of main beam rear support seats; A diagonal brace support beam is installed at the bottom of the upper slide rail support beam; A lifting column, which is hinged to one side of the bottom of the diagonal brace support beam; A middle crossbeam is provided in the middle of the lifting column, and a pulley assembly is installed on the middle crossbeam. The lower crossbeam is installed at the lower end of the lifting column and is hinged to the bottom of the diagonal support beam via diagonal bracing rods.

[0015] In some embodiments, the auxiliary outrigger structure includes: Auxiliary support leg steel frame, which is hinged to the bottom front end of the main beam via a hinged seat at the upper end of a tilting cylinder; A tilting cylinder assembly is disposed between the auxiliary support leg steel frame and the main beam; A bottom grounding support beam is connected to the lower end of the auxiliary leg steel frame via a telescopic hydraulic cylinder device. The bottom inclined grounding support beam is hinged to the bottom grounding support beam through the inclined reinforcement support of the lower crossbeam, and can be rotated around the hinge point by an electric hoist to adjust its grounding angle.

[0016] In some embodiments, the folding operation of the upper curved beam is configured with a hand-operated hoist traction system, one end of which is fixed to the main beam and the other end to the upper curved beam; the folding operation of the lower curved beam is configured with an electric hoist traction system, one end of which is fixed to the main beam and the other end to the lower curved beam; by operating the hand-operated hoist and the electric hoist respectively, the sequential and controllable folding of the rear support leg structure can be achieved.

[0017] In some embodiments, the lifting and folding operation of the front outrigger structure is further equipped with a safety locking mechanism; the safety locking mechanism includes a hinge pin II for fixing the telescopic column assembly and the outrigger assembly, and a hinge pin I for fixing the outrigger assembly and the pier support; each hinge pin is inserted into or pulled out of the corresponding hole by manual hammering to achieve mechanical interlocking of the telescopic column assembly and the outrigger assembly, preventing accidental retraction caused by cylinder depressurization in the supported state.

[0018] Compared with the prior art, the present invention has the following beneficial effects: This invention successfully solves the transportation profile limitations faced by traditional equipment when relocating to confined spaces such as tunnels. Specifically, by equipping the rear outrigger structure, front outrigger structure, and auxiliary outrigger structure with controllable folding or adjustment functions, the entire machine can be transformed from a bulky working state to a compact transportation state, completely avoiding cumbersome and costly large-scale disassembly operations. This not only greatly improves relocation efficiency and shortens the project cycle, but also effectively reduces the risk of equipment damage and additional costs caused by repeated disassembly and assembly, giving the bridge erecting machine excellent maneuverability and site adaptability. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the rear support leg structure of the present invention; Figure 3 This is a schematic diagram of the front support leg structure of the present invention; Figure 4 This is a schematic diagram of the auxiliary support leg structure of the present invention; Figure 5 This is a perspective view of the present invention; Figure 6 for Figure 5 Enlarged view of point A; Figure 7 for Figure 5 Enlarged view of point B; Figure 8 for Figure 5 Enlarged view of point C; In the diagram, 1-main beam, 2-rear outrigger structure, 3-front outrigger structure, 4-auxiliary outrigger structure, 5-upper portal beam, 6-upper portal beam folding cylinder, 7-upper portal beam folding hinge seat, 8-upper curved beam, 9-lower curved beam, 10-lower curved beam base, 11-lower curved beam base transport trolley, 12-main beam rear support seat, 13-upper slide rail support crossbeam, 14-outrigger lifting hydraulic cylinder, 15-diagonal brace support beam, 16-diagonal brace upper section rod, 17-diagonal brace middle section rod, 18-diagonal brace lower section rod, 19-ground contact beam support beam. 20-Auxiliary outrigger steel frame, 21-Tilting cylinder assembly, 22-Telescopic cylinder device, 23-Bottom grounding support beam, 24-Lower crossbeam diagonal reinforcement support, 25-Bottom diagonal grounding support beam, 26-Upper curved beam folding hinge seat, 27-Lower curved beam folding hinge seat, 28-Telescopic column assembly, 29-Outrigger assembly, 30-Holding support, 31-Top main crossbeam and main steel frame, 32-Middle crossbeam, 33-Lower crossbeam, 34-Pulley assembly, 35-Tilting cylinder upper hinge seat, 36-Triangular bracket. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are some embodiments of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0021] A construction method for a bridge erecting machine in height-restricted locations includes the following steps: S1: At least two hydraulic brackets are installed on the beam transport vehicle to support the bridge erecting machine. The rear support leg structure 2 of the bridge erecting machine is installed on the beam transport vehicle and can move along the beam transport vehicle. The front support leg structure 3 and the auxiliary support leg structure 4 of the bridge erecting machine are located in front of the beam transport vehicle. S2: The beam transport vehicle lifts the bridge erecting machine to a height-restricted location, lowers the bridge erecting machine to a low position, and then passes through the height-restricted location; S3: Pass through the height-restricted area and ensure that the front outrigger structure 3 is stably supported on the pier; S4: At this stage, the rear of the bridge erecting machine is still in a height-restricted position. The bridge erecting machine moves forward on the beam transport vehicle and simultaneously places the front leg structure 3 and the auxiliary leg structure 4 on the corresponding pier in front. S5: Using the auxiliary support leg structure 4 and the rear hydraulic bracket, the bridge erecting machine is synchronously lifted to restore the main beam of the bridge erecting machine to its normal height. S6: Operate on the rear support leg structure 2, fold the upper curved beam 8, upper door beam 5 and lower curved beam 9 back to their original positions.

[0022] After step S6, the process also includes: the rear support leg structure 2 being lifted, the hydraulic bracket being detached from the main beam 1, the beam transport vehicle returning to the beam yard for beam loading, and the bridge erecting machine completing its operation.

[0023] In a specific embodiment, step S2, lowering the bridge erecting machine to a low position, specifically includes: S21: By using the hydraulic bracket to retract synchronously, the main beam 1 of the bridge erecting machine is smoothly lowered from a high position to a low position; S22: Perform a folding operation on the front outrigger structure 3 and the auxiliary outrigger structure 4: The front support leg structure 3 is folded and flipped toward the main beam 1 by an electric hoist. The auxiliary outrigger structure 4 retracts by driving the tilting cylinder assembly 21, which in turn causes the auxiliary outrigger steel frame 20 to tilt upward around the hinge point. S23: Perform a folding operation on the rear outrigger structure: Operate the upper door beam folding cylinder 6 to drive the upper door beam 5 to fold; The upper curved beam 8 and the lower curved beam 9 are folded relative to the main beam 1 by operating an electric hoist; S24: The bridge erecting machine is supported only by hydraulic brackets, and the hydraulic brackets are lowered to lower the entire bridge erecting machine.

[0024] In a specific embodiment, step S4 includes: S41: Operate the front outrigger structure 3 and the auxiliary outrigger structure 4 to fold back to the vertical state, wherein the front outrigger structure 3 is supported on the corresponding pier, and the auxiliary outrigger structure 4 is in a suspended state. After operation, the lower curved beam 9 in the support leg structure 2 is folded back to its original position, and the bridge erecting machine is supported by the lower curved beam 9, the lower curved beam base 10 and the lower curved beam base transport trolley 11. Disconnect the hydraulic bracket from the bridge erecting machine. The lower curved beam base transport trolley 11 of the rear support leg structure 2 drives the main beam 1 and the auxiliary support leg structure 4 to move forward. The front support leg structure 3 slides relative to the main beam 1 to maintain its own position. After the auxiliary leg structure 4 is moved forward to the corresponding pier position, the auxiliary leg structure 4 is operated to support itself on the pier.

[0025] Specifically, such as Figure 1As shown, the bridge erecting machine includes: a main beam 1, which is horizontally arranged, and a foldable rear support leg structure 2 at the rear end of the main beam 1; the rear support leg structure 2 is installed on the main beam 1 to support the movement of the main beam 1; a front support leg structure 3 is installed at the front end of the main beam 1, and the front support leg structure 3 can be folded around the connection point to support the main beam 1; and an auxiliary support leg structure 4 is hinged to the front end of the main beam 1, and the auxiliary support leg structure 4 can be angled or folded around the hinge point to support the main beam 1.

[0026] Specifically, such as Figure 2 , 5 As shown, the rear support leg structure 2 includes: an upper curved beam 8, which is connected to the main beam 1 via an upper curved beam folding hinge seat 26 and can be folded relative to the main beam 1; an upper door beam 5, which is hinged to the upper curved beam 8 and driven to rotate and fold by an upper door beam folding cylinder 6, one end of which is connected to the upper curved beam 8 and the other end is connected to the upper door beam folding hinge seat 7 fixed on the main beam 1; and a lower curved beam 9, which is connected to the bottom of the upper curved beam 8 via a lower curved beam folding hinge seat 27 and can be folded relative to the upper curved beam 8.

[0027] The folding operation of the upper curved beam 8 is equipped with a hand-operated hoist, one end of which is fixed to the main beam 1 and the other end of which is fixed to the upper curved beam 8; the folding operation of the lower curved beam 9 is equipped with an electric hoist, one end of which is fixed to the main beam 1 and the other end of which is fixed to the lower curved beam 9; by operating the hand-operated hoist and the electric hoist respectively, the sequential and controllable folding of the rear support leg structure can be achieved.

[0028] The rear support leg structure 2 includes: a lower curved beam base 10, which is installed at the bottom of the lower curved beam 9; and a lower curved beam base transport trolley 11, which is located on the lower side of the lower curved beam base 10.

[0029] Rear support leg structure 2 folding operation: The folding action of the upper door beam 5 is powered by the upper door beam folding cylinder 6, causing it to rotate around the upper door beam folding hinge seat 7. After folding, a reliable connecting structure must be installed on the main beam 1. The function of this connecting structure is to limit the displacement of the upper door beam during low-position transport, avoiding misalignment of the fixed end during subsequent repositioning operations, thereby ensuring the accuracy and safety of the upper door beam folding and repositioning operations.

[0030] Removal of the lower curved beam base 10: First, remove the connecting bolts between the lower curved beam base 10 and the lower curved beam 9. Then, with the help of the lower curved beam base transport trolley 11, the lower curved beam base 10 can be smoothly transported out along the trolley track pre-laid on the bridge.

[0031] Folding operation of the upper curved beam 8: First, connect the upper curved beam 8 to the connecting steel plate on the main beam 1 to ensure the stability of the upper curved beam 8 before folding. Next, remove the connecting bolts between the upper curved beam 8 and the upper gate beam folding hinge seat 7. Then, fold the upper curved beam 8 through the upper curved beam folding hinge seat 26. This folding action is carried out using a hand-operated hoist. One end of the hand-operated hoist is welded to the main beam 1 of the bridge erecting machine, and the other end is welded to the upper curved beam 8. The folding operation of the upper curved beam can be smoothly completed through the traction action of the hand-operated hoist.

[0032] Folding operation of the lower curved beam 9: After the upper curved beam 8 is folded to a position flush with the main beam 1, the lower curved beam 9 is folded using the lower curved beam folding hinge 27. This process is performed using an electric hoist, one end of which is welded to the main beam of the bridge erecting machine, and the other end is welded to the lower curved beam 9. The electric hoist provides stable and sufficient power to ensure the smooth folding operation of the lower curved beam.

[0033] Specifically, such as Figure 3 As shown, the front support leg structure 3 includes: a main beam rear support seat 12, of which two sets are provided, each of which can move along a guide rail provided on the main beam 1; an upper slide rail support beam 13, which is connected between the two sets of main beam rear support seats 12; a diagonal brace support beam 15, which is installed at the bottom of the upper slide rail support beam 13; a lifting column, which is hinged to one side of the bottom of the diagonal brace support beam 15; a middle crossbeam 32, which is located in the middle of the lifting column, and a pulley assembly 34 is installed on the middle crossbeam 32; and a lower crossbeam 33, which is installed at the lower end of the lifting column and is hinged to the front side of the bottom of the diagonal brace support beam 15 through a diagonal brace.

[0034] The lifting column is composed of a telescopic column assembly 28, a leg assembly 29 and a pier support 30 connected in sequence. The components are fixed together by hinge pins and are driven to lift by the leg lifting hydraulic cylinder 14.

[0035] The diagonal brace includes an upper diagonal brace 16, a middle diagonal brace 17, and a lower diagonal brace 18 connected as a whole; wherein, the front support leg structure 3 is folded as a whole by removing the lower crossbeam 33 and the lower diagonal brace 18, and using an electric hoist to lift the diagonal brace.

[0036] The lifting and folding operation of the front outrigger structure 3 is also equipped with a safety locking mechanism; the safety locking mechanism includes a hinge pin II for fixing the telescopic column assembly 28 and the outrigger assembly 29, and a hinge pin I for fixing the outrigger assembly 29 and the pier support 30; each hinge pin is inserted or pulled out of the corresponding hole by manual hammering to achieve mechanical interlocking and prevent accidental retraction caused by cylinder depressurization in the supported state.

[0037] The rear support seat 12 of the main beam can move on the moving guide rail at the bottom of the main beam 1 in a direction parallel to the main beam of the bridge erecting machine.

[0038] The outrigger assembly 29 can slide up and down within the telescopic column assembly 28, and the two are fixed together using a hinged pin II. The pier support 30 can slide within the outrigger assembly 29, and the two are fixed together using a hinged pin I. Since the telescopic column assembly, outrigger assembly, and pier support all have round holes for pin insertion, this connection method ensures sufficient reliability. The pins are manually hammered into their target positions. The telescopic column assembly 28 is hinged to the front support seat of the main beam using a front outrigger fixing pin, allowing the telescopic column assembly to rotate around the front outrigger fixing pin.

[0039] When sliding the front outrigger structure 3 up and down, firstly, the fixing pins of the lower and upper sections of the diagonal brace must be pulled out in sequence. Then, hinge pin I and hinge pin II must be pulled out in sequence. Immediately afterwards, the outrigger lifting hydraulic cylinder 14 starts working to control the lifting and lowering of the front outrigger. After lifting to the target height, the fixing pins are then manually inserted into the corresponding holes in sequence.

[0040] When folding the front outrigger structure 3, the fixing pin of the lower section of the diagonal brace connecting the lower crossbeam 33 and the lower section of the diagonal brace 18 must first be removed.

[0041] After removing the front support leg fixing pin between the lower crossbeam 33 and the lower section of the diagonal brace 18, a set of electric hoists is used to lift the diagonal brace so that it is completely tilted. The electric hoists can be directly welded to the appropriate area on the main beam of the bridge erecting machine.

[0042] For the folding of the front outrigger structure 3, the outrigger assembly 29 and the pier support 30 need to be extended and retracted. The power for this is provided by the outrigger lifting hydraulic cylinder 14, and the cylinders on both sides of the outrigger can drive the outrigger to lower its height.

[0043] Finally, the winch wire rope passes through the winch guide pulley assembly, the upper pulley assembly of the triangular bracket 36, and the upper pulley assembly of the middle crossbeam 34, and the winch retracts the wire rope to rotate the front outrigger steel frame.

[0044] like Figure 4As shown, the auxiliary support leg structure 4 includes: an auxiliary support leg steel frame 20, which is hinged to the bottom front end of the main beam 1 via a hinged seat 35 at the upper end of a tilting cylinder; a tilting cylinder assembly 21, which is disposed between the auxiliary support leg steel frame 20 and the main beam 1; a bottom grounding support beam 23, which is connected to the lower end of the auxiliary support leg steel frame 20 via a telescopic cylinder device 22; and a bottom oblique grounding support beam 25, which is hinged to the bottom grounding support beam 23 via an oblique reinforcing support 24 on a lower crossbeam, and can be rotated around the hinge point by an electric hoist to adjust its grounding angle.

[0045] The auxiliary outrigger structure 4 achieves its fixed support effect by relying on the hinge seat 35 at the upper end of the tilting cylinder. Simultaneously, the telescopic movement of the tilting cylinder assembly 21 drives the auxiliary outrigger steel frame to tilt around the hinge point. This tilting motion allows for precise control of the working angle of the auxiliary outrigger, thus meeting different bridge-building operation requirements and ensuring that the auxiliary outrigger is at an appropriate angle during bridge construction, enhancing the stability and accuracy of the bridge-building operation.

[0046] The bottom inclined grounding support beam 25 is hinged to the bottom grounding support beam 23 via the lower crossbeam inclined reinforcement support 24. This connection structure can effectively transfer loads and improve the overall support stability. During operation, the electric hoist provides driving power, and the lower crossbeam hinge base is pulled around the hinge point to achieve controllable rotation, thereby precisely adjusting the angle and posture of the bottom inclined grounding support beam to ensure that it remains in contact with the working surface. This meets the grounding support requirements of the bridge erecting machine under different working conditions, while avoiding uneven load distribution caused by support angle deviation.

[0047] The auxiliary outrigger structure 4 relies on the telescopic hydraulic cylinder devices 22 on both sides to provide stable driving force. Through the extension and retraction of the cylinder piston rods, the bottom ground support beam 23 can be precisely pushed to make a controllable displacement in the vertical direction relative to the top main beam 1. This displacement process can achieve a smooth lifting of the auxiliary outrigger height, and after being lifted into place, the telescopic hydraulic cylinder devices 22 on both sides can remain locked, ensuring that the auxiliary outrigger is stably lifted and continuously maintained in a high working posture, providing a reliable support foundation for the subsequent operation of the bridge erecting machine.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A construction method for a bridge erecting machine in height-restricted locations, characterized in that, Includes the following steps: S1: At least two hydraulic brackets are set on the beam transport vehicle to support the bridge erecting machine. The rear support leg structure (2) of the bridge erecting machine is set on the beam transport vehicle and can move along the beam transport vehicle. The front support leg structure (3) and auxiliary support leg structure (4) of the bridge erecting machine are located in front of the beam transport vehicle. S2: The beam transport vehicle lifts the bridge erecting machine at a high position and transports it to the height-restricted area. After lowering the bridge erecting machine to a low position, it passes through the height-restricted area. S3: When passing through the height-restricted area, the front outrigger structure (3) is stably supported on the pier; S4: At this stage, the tail of the bridge erecting machine is still in a height-restricted position. The bridge erecting machine moves forward on the beam transport vehicle and simultaneously erects the front support leg structure (3) and the auxiliary support leg structure (4) on the corresponding pier in front. S5: The bridge erecting machine is synchronously lifted using the auxiliary support leg structure (4) and the rear hydraulic bracket so that the main beam of the bridge erecting machine is restored to its normal height. S6: Operate the rear support leg structure (2) to fold the upper curved beam (8), upper door beam (5) and lower curved beam (9) back to their original positions.

2. The construction method of the bridge erecting machine in height-restricted locations according to claim 1, characterized in that, In step S2, the operation of lowering the bridge erecting machine to a low position specifically includes: Multiple hydraulic brackets are erected at the bottom of the main beam (1) of the bridge erecting machine. The hydraulic brackets are synchronously contracted to make the main beam (1) of the bridge erecting machine descend smoothly from a high position to a low position. Perform a folding operation on the front outrigger structure (3) and the auxiliary outrigger structure (4): The front support leg structure (3) is folded and flipped towards the main beam (1) by using an electric hoist for traction; The auxiliary outrigger structure (4) retracts by driving the tilting cylinder assembly (21), which in turn causes the auxiliary outrigger steel frame (20) to tilt upward around the hinge point; Perform a folding operation on the rear outrigger structure: Operate the upper door beam folding cylinder (6) to drive the upper door beam (5) to fold; The upper curved beam (8) and lower curved beam (9) are folded relative to the main beam (1) by operating an electric hoist; The bridge erecting machine is supported only by hydraulic brackets, and the entire bridge erecting machine is lowered by lowering the hydraulic brackets.

3. The construction method of the bridge erecting machine in height-restricted locations according to claim 1, characterized in that, Step S4 includes: The front outrigger structure (3) and the auxiliary outrigger structure (4) are folded back to the vertical state, with the front outrigger structure (3) supported on the corresponding pier and the auxiliary outrigger structure (4) suspended in the air. After operation, the lower curved beam (9) in the outrigger structure (2) is folded back to its original position, and the bridge erecting machine is supported by the lower curved beam (9), the lower curved beam base (10) and the lower curved beam base transport trolley (11); The connection between the hydraulic bracket and the bridge erecting machine is released. The lower curved beam base transport trolley (11) of the rear support leg structure (2) drives the main beam (1) and the auxiliary support leg structure (4) to move forward. The front support leg structure (3) slides relative to the main beam (1) to maintain its own position. After the auxiliary leg structure (4) is moved forward to the corresponding pier position, the auxiliary leg structure (4) is operated to support itself on the pier.

4. The construction method of the bridge erecting machine in height-restricted locations according to claim 1, characterized in that, Following step S6, the following is also included: The rear outrigger structure (2) is lifted, the hydraulic bracket is separated from the main beam (1), the beam transport vehicle returns to the beam yard to load the beam, and the bridge erecting machine completes the operation.

5. The construction method of the bridge erecting machine in height-restricted locations according to claim 1, characterized in that, The bridge erecting machine includes: Main beam (1), the main beam (1) is set horizontally; The rear support leg structure (2) is installed on the main beam (1) structure to support the main beam (1) in its movement. Front support leg structure (3), which is slidably installed at the front end of the main beam (1), and which can be folded around the connection position to support the main beam (1). The auxiliary support leg structure (4) is hinged to the front end of the main beam (1). The auxiliary support leg structure (4) can be adjusted or folded around the hinge point to support the main beam (1).

6. The construction method of the bridge erecting machine in height-restricted locations according to claim 5, characterized in that, The rear support leg structure includes: The upper curved beam (8) is connected to the main beam (1) through the upper curved beam folding hinge seat (26), and can be folded relative to the main beam (1); Upper door beam (5), the upper door beam (5) is hinged on the upper curved beam (8) and can be driven to rotate and fold by the upper door beam folding cylinder (6). One end of the upper door beam folding cylinder (6) is connected to the upper curved beam (8) and the other end is connected to the upper door beam folding hinge seat (7) fixed on the main beam (1). The lower curved beam (9) is connected to the bottom of the upper curved beam (8) via the lower curved beam folding hinge seat (27), and can be folded relative to the upper curved beam (8); Lower curved beam base (10), the lower curved beam base (10) is installed at the bottom of the lower curved beam (9); The lower curved beam base transport trolley (11) is located at the bottom of the lower curved beam base (10).

7. The construction method of the bridge erecting machine in height-restricted locations according to claim 5, characterized in that, The front support leg structure (3) includes: The main beam rear support (12) is provided in two sets, both of which can move along the guide rail provided at the bottom of the main beam (1); The upper slide rail support beam (13) is connected between the two sets of main beam rear support seats (12); A diagonal bracing support beam (15) is installed at the bottom of the upper slide rail support beam (13); The lifting column is hinged to one side of the bottom of the diagonal brace support beam (15); A middle crossbeam (32) is provided in the middle of the lifting column, and a pulley assembly (34) is installed on the middle crossbeam (32). The lower crossbeam (33) is installed at the lower end of the lifting column and is hinged to the bottom of the diagonal support beam (15) by a diagonal brace.

8. The construction method of the bridge erecting machine in height-restricted locations according to claim 5, characterized in that, The auxiliary support leg structure (4) includes: Auxiliary support leg steel frame (20), the auxiliary support leg steel frame (20) is hinged to the bottom of the front end of the main beam (1) through the upper hinge seat (35) of the flipping cylinder; A tilting cylinder assembly (21) is disposed between the auxiliary support leg steel frame (20) and the main beam (1); Bottom grounding support beam (23), the bottom grounding support beam (23) is connected to the lower end of the auxiliary support leg steel frame (20) through telescopic hydraulic cylinder device (22); The bottom inclined grounding support beam (25) is hinged to the bottom grounding support beam (23) by the lower crossbeam inclined reinforcement support (24), and can be rotated around the hinge point by an electric hoist to adjust its grounding angle.

9. The construction method of the bridge erecting machine in height-restricted locations according to claim 6, characterized in that, The folding operation of the upper curved beam (8) is equipped with a hand-operated hoist traction system, with one end of the hand-operated hoist fixed to the main beam (1) and the other end fixed to the upper curved beam (8); the folding operation of the lower curved beam (9) is equipped with an electric hoist traction system, with one end of the electric hoist fixed to the main beam (1) and the other end fixed to the lower curved beam (9); by operating the hand-operated hoist and the electric hoist respectively, the sequential controllable folding of the rear support leg structure can be achieved.

10. The construction method of the bridge erecting machine in height-restricted locations according to claim 7, characterized in that, The lifting and folding operation of the front outrigger structure (3) is also equipped with a safety locking mechanism; the safety locking mechanism includes a hinge pin II for fixing the telescopic column assembly (28) and the outrigger assembly (29), and a hinge pin I for fixing the outrigger assembly (29) and the pier support (30); each hinge pin is inserted or pulled out of the corresponding hole by manual hammering to achieve mechanical interlocking of the telescopic column assembly and the outrigger assembly, and to prevent accidental retraction caused by cylinder depressurization in the supported state.

Images