A walking bridge erecting machine and its control method

Abstract

This invention discloses a walking-type bridge erecting machine and its control method. The bridge erecting machine includes a middle support leg assembly, a front support leg assembly, and a trolley assembly. The middle support leg assembly and the front support leg assembly each include: an upper sliding structure connected to a guide beam, a lower support structure connected to a traveling mechanism, and a lateral drive device installed on the lower support structure. The upper sliding structure slides relative to the lower support structure under the action of the lateral drive device. The trolley assembly includes a trolley main beam for sliding support of the lateral trolley, a trolley column connecting the guide beam, and a gear and rack meshing structure located between the two. The lateral drive device is controlled to drive the upper sliding structure to move, thereby causing the guide beam to expand or contract laterally, and causing the trolley column to move relative to the trolley main beam. This invention can automatically adjust the lateral span of the guide beam and adapt to the precast beam erection requirements of skew bridges, curved bridges, and bridges with varying widths without disassembly and reassembly.

Description

Technical Field

[0001] This invention relates to the field of bridge construction machinery technology, and in particular to a laterally extendable walking bridge erecting machine and its control method. Background Technology

[0002] Bridge erecting machines are crucial mechanical equipment used in bridge engineering for the transportation and erection of precast beams. Existing walking-type bridge erecting machines offer advantages such as strong adaptability and stable operation, and are widely used in the construction of bridges in mountainous areas, high piers, and continuous beam bridges. However, traditional walking-type bridge erecting machines have relatively fixed structural dimensions and can only make minor angle adjustments by staggering the two main beams. They lack the ability to adapt to large-range conditions, making adjustments difficult when the erection route has a large angle with the underpass section, resulting in very long crossing times and impacting the construction schedule. In the construction of bridges with different alignments and varying widths, lateral adaptation requires methods such as overall disassembly, movement, and reassembly. This leaves little lateral clearance for the precast beams, and some precast beams cannot even be transported into the bridge erecting machine's internal space using standard methods. Even slight swaying during beam transportation can cause collisions with the bridge erecting machine's truss, leading to low construction efficiency and high labor costs and safety risks.

[0003] In existing technologies, although bridge erecting machines possess lateral movement capabilities—for example, adjustable traveling mechanisms are installed at the bottom of the front and middle outriggers, allowing for adjustment of the traveling direction via slewing supports—their design primarily targets the synchronous, unidirectional, and overall lateral movement of the two guide beams to adapt to the erection requirements of skew and curved bridges, rather than the simultaneous expansion of the two guide beams to both sides to increase internal space. The middle outrigger's central support beam, as a key load-bearing component connecting the two guide beams and the middle outrigger, along with the front outrigger as the main load-bearing support of the entire machine and the overhead crane as the sole transport vehicle, bears enormous vertical and horizontal loads during beam lifting and movement. Their structural form directly restricts the load-bearing capacity after the guide beams have reversed their lateral movement; any structural modifications must prioritize ensuring structural stability, safety, and load-bearing capacity. Therefore, designing structural components capable of supporting the simultaneous lateral movement of the two guide beams while maintaining load-bearing performance has become a pressing technical problem in this field. Summary of the Invention

[0004] Therefore, this invention proposes a walking bridge erecting machine structure with lateral retractability, which connects with the existing bridge erecting machine operation process and expands the internal space of the bridge erecting machine under certain conditions.

[0005] To address the aforementioned technical problems, the present invention provides the following technical solution: A walking-type bridge erecting machine includes a middle support leg assembly, a front support leg assembly, and a trolley assembly. The middle support leg assembly and the front support leg assembly each include: an upper sliding structure connected to a guide beam, a lower support structure connected to a traveling mechanism, and a lateral drive device installed on the lower support structure. The upper sliding structure slides relative to the lower support structure under the action of the lateral drive device. The trolley assembly includes a trolley main beam for sliding support of a lateral trolley, a trolley column connected to the guide beam, and a gear and rack meshing structure located between the two. The lateral drive device controls the movement of the upper sliding structure, thereby causing the guide beam to expand or contract laterally, and causing the trolley column to move relative to the trolley main beam.

[0006] In some embodiments of the present invention, the lower support structure of the middle outrigger assembly includes a middle outrigger mounting bracket and a middle outrigger lower crossbeam assembly fixedly connected to the middle outrigger mounting bracket, and at least two sets of first lateral drive devices are mounted on the top of the middle outrigger lower crossbeam assembly. In some embodiments of the present invention, the upper sliding structure of the middle support leg assembly includes two sets of upper crossbeam assemblies of the middle support leg, which are slidably connected to the upper side of the lower crossbeam assembly of the middle support leg. The two sets of upper crossbeam assemblies of the middle support leg move laterally relative to the lower crossbeam assembly of the middle support leg under the drive of the two sets of the first lateral drive devices.

[0007] In some embodiments of the present invention, a guide structure is provided between the lower crossbeam assembly of the middle support leg and the upper crossbeam assembly of the middle support leg, and the guide structure guides the movement direction of the upper crossbeam assembly of the middle support leg.

[0008] In some embodiments of the present invention, the guide structure includes a sliding groove disposed on the top surface of the lower crossbeam assembly of the middle support leg or the bottom surface of the upper crossbeam assembly of the middle support leg, and a sliding protrusion disposed on the bottom surface of the upper crossbeam assembly of the middle support leg or the top surface of the lower crossbeam assembly of the middle support leg, wherein the sliding groove extends laterally.

[0009] In some embodiments of the present invention, the top of the lower crossbeam assembly of the middle support leg has a receiving chamber, and at least a portion of the upper crossbeam assembly of the middle support leg is located within the receiving chamber; the guiding structure includes a guide rail and a guide wheel assembly disposed between the longitudinal sidewall of the receiving chamber and the longitudinal sidewall of the upper crossbeam assembly of the middle support leg, the guide wheel assembly sliding relative to the guide rail.

[0010] In some embodiments of the present invention, the lower support structure of the front outrigger assembly includes a front outrigger mounting bracket, a telescopic outrigger mounted on the front outrigger mounting bracket and capable of vertical extension and retraction, and a transverse sliding block mounted on the telescopic outrigger, with a second transverse driving device mounted on the top of the transverse sliding block; the upper support structure of the front outrigger assembly includes a transverse slider slidably connected to the upper side of the transverse sliding block, the transverse slider moving laterally relative to the transverse sliding block under the drive of the second transverse driving device.

[0011] In some embodiments of the present invention, a sliding track cooperating with the transverse trolley is provided on the upper side of the main beam of the gantry crane; a supporting transverse wall and a rack are provided on the lower side of the main beam of the gantry crane in the area corresponding to the two sets of guide beams; a gearbox seat is provided on the upper side of the gantry crane column, and a gear set cooperating with the rack is provided in the gearbox seat.

[0012] In some embodiments of the present invention, a connection and positioning structure is further provided between the supporting transverse wall and the gearbox seat. The connection and positioning structure includes a connection hole disposed between the two and a bolt fastening assembly passing through the connection hole.

[0013] In some embodiments of the present invention, displacement sensors disposed on two sets of guide beams are also included for real-time monitoring of the lateral movement of the guide beams.

[0014] This invention also provides a control method for the walking-type bridge erecting machine described in any of the above embodiments, wherein the lateral expansion operation of the guide beam includes the following steps: The lateral drive devices controlling the middle outrigger assembly and the front outrigger assembly are activated synchronously, causing the upper sliding structures of the middle outrigger assembly and the front outrigger assembly to move away from each other, thereby driving the guide beam to move. When the guide beam moves to the set position, the lateral drive device is controlled to stop and enter a position locked state.

[0015] The technical solution of the present invention has the following technical effects compared with the prior art: The walking bridge erecting machine provided by this invention can actively and continuously adjust the lateral span of the guide beam through the built-in lateral sliding structure of the middle and front legs. It can adapt to the precast beam erection requirements of skew bridges, curved bridges and bridges with varying widths without disassembly and assembly, thus solving the problem of low construction efficiency caused by the frequent disassembly and assembly required by traditional walking bridge erecting machines in complex alignment construction. Attached Figure Description

[0016] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which will help to understand the purpose and advantages of the present invention, wherein: Figure 1 This is a schematic diagram of one embodiment of the middle support leg assembly of the walking bridge erecting machine of the present invention; Figure 2 A partial schematic diagram of one embodiment of the middle support leg assembly provided by the present invention; Figure 3 This is a schematic diagram of one embodiment of the front support leg assembly of the walking bridge erecting machine of the present invention; Figure 4 This is a schematic diagram of one embodiment of the overhead crane assembly of the walking bridge erecting machine of the present invention; Figure 5 This is a partial schematic diagram of one embodiment of the overhead crane component in the walking-type bridge erecting machine of the present invention; Figure 6 This is a schematic diagram of the lateral expansion state of the double guide beams of the walking bridge erecting machine of the present invention. Detailed Implementation

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

[0018] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for 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. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0019] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0020] Furthermore, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0021] like Figure 1 , Figure 2The image shows a specific embodiment of the walking-type bridge erecting machine provided by the present invention. This bridge erecting machine has lateral telescopic capability, allowing for lateral expansion operations during the erection of precast beams on skew bridges, curved bridges, or bridges with varying widths, thereby improving construction safety.

[0022] The bridge erecting machine mainly includes a front outrigger assembly 200, a middle outrigger assembly 300, a rear outrigger assembly (not shown in the figure), and a trolley assembly 400. Among them, the middle outrigger assembly 300 and the front outrigger assembly 200 together form the lateral adjustment foundation of the bridge erecting machine, while the rear outrigger assembly and the trolley assembly 400 realize the follow-up coordination with the lateral movement of the guide beam 100.

[0023] The middle outrigger assembly 300 and the front outrigger assembly 200 each include: an upper sliding structure A fixedly connected or supported by the guide beam 100; a lower support structure B connected to the traveling mechanism C and providing stable support; and a lateral drive device mounted on the lower support structure B. The lateral drive device is preferably a hydraulic cylinder, with its telescopic rod end connected to the upper sliding structure A. Driven by the lateral drive device, the upper sliding structure A can slide linearly relative to the lower support structure B in the lateral direction (i.e., the width direction of the bridge erecting machine). This structure enables the middle and front outriggers to have lateral adjustment capabilities. When the lateral drive device is activated, the upper sliding structure A drives the guide beam 100 to move laterally, thereby achieving active expansion or contraction of the entire machine's span without disassembling the outriggers, significantly improving the bridge erecting machine's adaptability to curved and widened sections of the bridge.

[0024] Specifically, in one embodiment, regarding the middle support leg assembly 300, see [link to relevant documentation]. Figure 1 , Figure 2 The lower support structure B specifically includes a middle support leg mounting bracket 301 and a middle support leg lower crossbeam assembly 302 fixedly connected thereto. A traveling mechanism C is provided on the lower side of the middle support leg mounting bracket 301, and at least two sets of first lateral drive devices 303 are installed at lateral intervals on the top of the middle support leg lower crossbeam assembly 302.

[0025] The upper sliding structure A of the middle support leg assembly 300 includes two independent sets of upper crossbeam assemblies 304, each connected to one of the two sets of guide beams 100. Each set of upper crossbeam assemblies 304 is slidably connected to the upper side of the lower crossbeam assembly 302 and connected to the output end of at least one set of first lateral drive devices 303. The two sets of first lateral drive devices 303 can controllably drive the two sets of upper crossbeam assemblies 304 to symmetrically expand or contract, further realizing independent or coordinated control of the two sets of guide beams 100. When erecting a widened bridge section, the two sets of upper crossbeam assemblies 304 can be controlled to move in opposite directions, so that the guide beams 100 expand symmetrically with the bridge centerline as the reference; while when erecting a skew bridge, the two sets of upper crossbeam assemblies 304 can be controlled to move in the same direction, so that the guide beams 100 as a whole move laterally to adapt to the beam deflection angle, greatly improving construction flexibility. Of course, when the guide beam 100 needs to be moved laterally as a whole, the traveling mechanism C of the middle support leg assembly 300 can also be controlled to move the upper support structure and the lower support structure of the middle support leg assembly 300 as a whole.

[0026] More specifically, a middle support leg column 305 is provided between the middle support leg upper crossbeam assembly 304 and the guide beam 100. A lifting cylinder is installed inside the middle support leg column 305. During the lateral expansion of the double guide beams, the lifting cylinder first reliably fixes the upper crossbeam assembly 304 of the middle support leg assembly 300 to the bridge deck, allowing its lower support structure B to bear the main load. Then, the first lateral drive device 303 is driven to symmetrically expand the middle support leg upper crossbeam assembly 304.

[0027] In one optional embodiment, the first lateral drive device 303 is a hydraulic cylinder, such as... Figure 1 As shown, each set of middle outrigger upper crossbeam assemblies 304 is synchronously driven by hydraulic cylinders located on both sides to ensure smooth movement. The hydraulic cylinders have built-in displacement sensors that can monitor the lateral movement of the middle outrigger upper crossbeam assembly 304 and the guide beam 100 in real time.

[0028] like Figure 2 As shown, to ensure the straightness and stability of the sliding, a guide structure is provided between the lower crossbeam assembly 302 and the upper crossbeam assembly 304 of the middle support leg. In a specific embodiment, the guide structure includes a transverse groove 302a disposed on the top surface of the lower crossbeam assembly 302 and a sliding protrusion 304a disposed on the bottom surface of the upper crossbeam assembly 304. The groove 302a is constructed as a groove extending laterally with a V-shaped cross-section, and the shape of the sliding protrusion 304a matches the groove 302a and is embedded within it. The cooperation between the groove and the sliding protrusion restricts the degrees of freedom of the upper crossbeam in the longitudinal and vertical directions, ensuring that it moves only along a preset straight line under the action of the transverse drive device, preventing jamming or lateral displacement under eccentric loading, and improving the structural stability during large-span transverse movement.

[0029] See Figure 2 In one optional embodiment, the top of the lower crossbeam assembly 302 of the middle support leg has an upwardly opening receiving chamber. At least the lower region of the upper crossbeam assembly 304 of the middle support leg is received within this receiving chamber. The guiding structure includes a guide rail 302b disposed on the longitudinal inner wall of the receiving chamber, and a guide wheel assembly 304b disposed on the longitudinal side wall of the upper crossbeam assembly 304 of the middle support leg, the guide wheel assembly 304b sliding along the guide rail 302b. This built-in guiding structure changes the sliding fit to a rolling fit, resulting in less frictional resistance, and is particularly suitable for the heavy-load lateral movement of large-tonnage bridge erecting machines. At the same time, the receiving chamber encloses and protects the upper sliding structure, effectively preventing dust and falling rocks from entering the sliding interface, thus improving reliability in harsh bridge construction environments.

[0030] like Figure 3 As shown, the lower support structure B of the front outrigger assembly 200 includes: a front outrigger mounting bracket 201, a telescopic outrigger 202 mounted on the front outrigger mounting bracket 201 and capable of extending and retracting longitudinally (vertically), and a transverse sliding block 203 mounted on the top of the telescopic outrigger 202. A second transverse drive device 204 is mounted on the top of the transverse sliding block 203. The upper support structure A of the front outrigger assembly 200 includes a transverse sliding block 205, which is slidably connected to the upper side of the transverse sliding block 203 and moves laterally relative to the transverse sliding block 203 under the drive of the second transverse drive device 204. This design integrates the transverse sliding structure into the top of the telescopic front outrigger. On the one hand, the telescopic outrigger 202 can adapt to changes in the longitudinal slope of the bridge; on the other hand, the transverse sliding block 205 directly drives the guide beam 100 at the front end to move laterally, coordinating with the middle outrigger assembly 300 to achieve synchronous transverse adjustment of all outriggers of the machine. In addition, the lateral movement structure of the front outriggers is independent of its height adjustment function, and the two do not interfere with each other, thus improving control precision.

[0031] In one optional embodiment, the second lateral drive device 204 is a hydraulic cylinder, such as... Figure 3 As shown, the transverse slider 205 is synchronously driven by hydraulic cylinders located on both sides to ensure smooth movement. The hydraulic cylinders have built-in displacement sensors that monitor the lateral movement position of the transverse slider 205 relative to the guide beam 100 in real time.

[0032] See Figure 4 , Figure 5The overhead crane assembly 400 includes a main crane beam 401, an overhead crane column 402, and a gear and rack mechanism. Specifically, the upper side of the main crane beam 401 is provided with a sliding rail for supporting and guiding the lateral trolley 408 (used for hoisting precast beams) to move laterally. On the lower side of the main crane beam 401, in areas corresponding to the two sets of guide beams 100, a supporting transverse wall 403 and a rack 404 are respectively provided, both extending laterally. The upper end of the overhead crane column 402 is provided with a gearbox seat 405, inside which a gear set 406 is installed. This gear set 406 meshes with the rack 404. The lower end of the overhead crane column 402 is fixedly connected to the guide beams 100.

[0033] When the guide beam 100 moves laterally under the drive of the middle and front outriggers, the overhead crane column 402 moves synchronously with the guide beam 100. At this time, the gear set 406 meshes and rotates relative to the fixed rack 404. This ensures that the main beam 401 of the overhead crane is always located at the center position of the two sets of guide beams 100, avoiding uneven load on the overhead crane caused by the lateral movement of the guide beam 100. The high-precision meshing of the gear and rack ensures the parallelism between the main beam 401 of the overhead crane and the guide beam 100, preventing the overhead crane column 402 from tilting.

[0034] Based on the above, such as Figure 4 As shown, a connection and positioning structure is also provided between the supporting transverse wall 403 and the gearbox seat 405. This structure specifically includes: connecting holes 403a and 405a respectively provided on the supporting transverse wall 403 and the gearbox seat 405, and a bolt fastening assembly 407 passing through the connecting holes. When the guide beam 100 moves into position, the bolt fastening assembly 407 can be tightened to achieve a rigid connection between the supporting transverse wall 403 and the gearbox seat 405. When the bridge erecting machine needs to maintain a certain lateral span for a long time during beam erection operations, in addition to relying on the position locking function of the lateral drive device, the mechanical bolt connection further restricts the relative movement between the gantry column 402 and the gantry main beam 401, eliminating the slight shaking that may be caused by gear and rack backlash, and providing a stable hoisting benchmark for the precise placement of the precast beam.

[0035] Specifically, the walking-type bridge erecting machine also includes displacement sensors (not shown in the figure) installed on the two sets of guide beams 100. These displacement sensors can be wire-type displacement sensors or laser rangefinders, used to monitor the lateral movement of the guide beams 100 in real time and feed the position signal back to the central controller (PLC) of the bridge erecting machine. This allows the control system to accurately know the current lateral span of the guide beams 100 and their symmetry relative to the bridge centerline, thereby achieving synchronous control of multiple legs and preventing the guide beams 100 from twisting or deforming.

[0036] This invention also provides a specific implementation of the control method based on the above-mentioned walking-type bridge erecting machine, wherein the lateral extension operation of the guide beam of the bridge erecting machine is used in the following scenarios: such as Figure 6 As shown, for a bridge erection site with a river and road at an angle of φ° and a beam length of 40m, taking a walking-type bridge erection machine with a conventional guide beam length of 50m as an example, the bridge erection machine is rectangular in normal condition with a net width W=5.5m; the long side of the abutment is aligned with the water flow direction. After the double main beams of the bridge erection machine are misaligned, the net width W' becomes: W' = W·sinφ. When φ<30°, W'<2.75m. For box girder beams with a width exceeding 2.75m, they cannot enter the bridge erection machine after misalignment adjustment, and beam erection cannot be carried out unless a larger model of bridge erection machine is selected. By using the structure of the bridge erection machine described above in this invention, the distance between the left and right main beams can be extended synchronously. For example, after extending each of the left and right main beams by 1m, W' can increase by 1m when φ=30°, exceeding the beam width of 2.5m while ensuring a sufficient safe distance between the beam and the bridge erection machine, thereby enabling beam feeding and moving operations. The aforementioned lateral expansion operation of the guide beam is initiated as needed after the bridge erecting machine completes the crossing of the span and the adjustment of the angle and posture. Once the internal space of the bridge erecting machine meets the requirements for feeding the beam, the lateral stretching or shrinking function is turned off and the width is locked, and the subsequent beam feeding and moving process begins.

[0037] The lateral stretching and expansion operation includes the following steps: Step S101: Synchronously start the lateral drive devices of the middle outrigger assembly 300 and the front outrigger assembly 200. Specifically, the central controller simultaneously sends action commands to the first lateral drive device 303 and the second lateral drive device 204, causing the middle outrigger upper crossbeam assembly 304 and the lateral sliding block 205 to move in opposite directions (i.e., to both sides of the bridge erecting machine), thereby smoothly driving the two sets of guide beams 100 to expand outward.

[0038] Step S102: When the guide beam 100 moves to the preset construction position, the controller controls all lateral drive devices to stop operating and uses the self-locking function of the hydraulic lock or lead screw to lock them in the position.

[0039] In step S102 above, the specific method for determining that the guide beam 100 has moved to the set position is as follows: the controller calculates the distance between the two sets of guide beams 100 in real time based on the detection signals from position sensors installed on the two sets of guide beams 100 or on the lateral drive device. When the distance reaches the first preset threshold for the current curved or skewed bridge section, the controller determines that the guide beam 100 is in place.

[0040] Subsequently, the control system issues a prompt or automatically executes a locking command, and the operator or automated robotic arm tightens the bolt fastening assembly 407 in the overhead crane assembly 400, locking the support transverse wall 403 to the gearbox seat 405. After the bolts are tightened, a rigid "portal" frame structure is formed between the main beam 401 and the guide beam 100 of the overhead crane, significantly improving the overall rigidity and torsional resistance of the bridge erecting machine in the lateral expansion state.

[0041] This control method enables active and controllable adjustment of the entire machine's lateral span. Synchronous start-up avoids additional bending moments or shear forces on the guide beam 100 due to differences in action timing. The position locking function ensures that the span of the guide beam 100 remains constant during subsequent heavy-load girder erection, guaranteeing construction safety.

[0042] Throughout the lateral expansion operation of the guide beam 100, the rear outrigger assembly of the bridge erecting machine (located behind the middle outrigger, not shown in the figure) remains suspended under hydraulic control, meaning the support shoe of the rear outrigger is out of contact with the bridge deck or the already erected beam surface. Suspending the rear outrigger releases rear constraints, allowing the bridge erecting machine to function as a dual-support system with the front and middle outriggers as fulcrums. Because the front and middle outriggers possess lateral sliding capabilities, this state minimizes resistance during the lateral expansion of the guide beam 100 and prevents additional internal stress in the guide beam 100 or outrigger structure due to the lateral constraints of the rear outrigger.

[0043] After the guide beam 100 has completed its lateral expansion, all outrigger positions are locked, and the gantry assembly 400 bolts are tightened, the precast beam laying operation begins. At this time, the lateral trolley 408 can travel laterally along the sliding track of the gantry main beam 401, precisely transporting and lowering the precast beam to the predetermined position. This process of expanding before laying ensures that the bridge erecting machine operates in the posture most suitable for the current lateral dimensions of the bridge span, avoiding the dangerous operations of having to repeatedly switch gantry cranes or misalign precast beams due to insufficient span of the guide beam 100 on curved or skewed bridge sections, thus significantly improving construction efficiency and safety.

[0044] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. A walking-type bridge erecting machine, comprising a middle support leg assembly, a front support leg assembly, and a crane assembly, characterized in that, The middle outrigger assembly and the front outrigger assembly each include: The upper sliding structure is connected to the guide beam, the lower support structure is connected to the traveling mechanism, and the lateral drive device is installed on the lower support structure. The upper sliding structure slides relative to the lower support structure under the action of the lateral drive device. The crane assembly includes a crane main beam for sliding support of the transverse trolley, a crane column connecting the guide beam, and a gear and rack meshing structure located between the two. The lateral drive device is controlled to drive the upper sliding structure to move, thereby causing the guide beam to expand or contract laterally, and causing the crane column to move relative to the crane main beam.

2. The walking bridge erecting machine according to claim 1, characterized in that, The lower support structure of the middle outrigger assembly includes a middle outrigger mounting bracket and a middle outrigger lower crossbeam assembly fixedly connected to the middle outrigger mounting bracket. At least two sets of first lateral drive devices are installed on the top of the middle outrigger lower crossbeam assembly. The upper sliding structure of the middle support leg assembly includes two sets of upper crossbeam assemblies of the middle support leg, which are slidably connected to the upper side of the lower crossbeam assembly of the middle support leg. The two sets of upper crossbeam assemblies of the middle support leg move laterally relative to the lower crossbeam assembly of the middle support leg under the drive of the two sets of the first lateral drive devices.

3. A walking-type bridge erecting machine according to claim 2, characterized in that, A guide structure is provided between the lower crossbeam assembly of the middle support leg and the upper crossbeam assembly of the middle support leg, and the guide structure guides the movement direction of the upper crossbeam assembly of the middle support leg.

4. A walking-type bridge erecting machine according to claim 3, characterized in that, The guide structure includes a sliding groove disposed on the top surface of the lower crossbeam assembly of the middle support leg or the bottom surface of the upper crossbeam assembly of the middle support leg, and a sliding protrusion disposed on the bottom surface of the upper crossbeam assembly of the middle support leg or the top surface of the lower crossbeam assembly of the middle support leg, wherein the sliding groove extends laterally.

5. A walking-type bridge erecting machine according to claim 4, characterized in that, The top of the lower crossbeam assembly of the middle outrigger has a receiving chamber, and at least a portion of the upper crossbeam assembly of the middle outrigger is located within the receiving chamber; the guiding structure includes a guide rail and a guide wheel assembly disposed between the longitudinal sidewall of the receiving chamber and the longitudinal sidewall of the upper crossbeam assembly of the middle outrigger, and the guide wheel assembly slides relative to the guide rail.

6. A walking-type bridge erecting machine according to claim 1, characterized in that, The lower support structure of the front outrigger assembly includes a front outrigger mounting bracket, a telescopic outrigger mounted on the front outrigger mounting bracket and capable of vertical extension and retraction, and a transverse sliding block mounted on the telescopic outrigger. A second transverse drive device is mounted on the top of the transverse sliding block. The upper support structure of the front outrigger assembly includes a lateral slider, which is slidably connected to the upper side of the lateral slide block. The lateral slider moves laterally relative to the lateral slide block under the drive of the second lateral drive device.

7. A walking-type bridge erecting machine according to claim 1, characterized in that, The upper side of the main beam of the overhead crane is provided with a sliding track that cooperates with the transverse trolley; the lower side of the main beam of the overhead crane is provided with a supporting transverse wall and a rack in the area corresponding to the two sets of guide beams. The upper side of the crane column is provided with a gearbox seat, and the gearbox seat is provided with a gear set that meshes with the rack.

8. A walking-type bridge erecting machine according to claim 7, characterized in that, A connection and positioning structure is also provided between the supporting transverse wall and the gearbox seat. The connection and positioning structure includes a connection hole provided between the two and a bolt fastening assembly passing through the connection hole.

9. A walking-type bridge erecting machine according to claim 1, characterized in that, It also includes a position sensor for real-time monitoring of the lateral movement of the guide beam.

10. A control method for a walking-type bridge erecting machine according to any one of claims 1-9, characterized in that, The lateral expansion operation of the guide beam includes the following steps: The lateral drive devices controlling the middle outrigger assembly and the front outrigger assembly are activated synchronously, causing the upper sliding structures of the middle outrigger assembly and the front outrigger assembly to move away from each other, thereby driving the guide beam to move. When the guide beam moves to the set position, the lateral drive device is controlled to stop and enter a position locked state.

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