A lowering device and bridge erecting machine suitable for variable-span segmental beam bridge construction

Abstract

The utility model provides a kind of to be suitable for the release device of variable-span segmental beam bridge construction, comprising: device body, is installed on the main beam of bridge erecting machine;Connecting frame, rotatably installed in one end of device body, for with the detachable connection of bridge erecting machine's headgear assembly;Walking component, rotatably installed in the other end of device body, with retracted state and unfolded state;First drive mechanism, is installed on device body, for driving connecting frame rotation to realize with the connection or disengagement of headgear assembly;Second drive mechanism, is installed on device body, for driving walking component rotation to switch between retracted state and unfolded state.The utility model by design by connecting frame and walking component collaborative action's unique structure, and using first and second drive mechanism respectively controls its state switching, makes release device without self-provided walking power source can be moved by headgear traction, effectively simplifies overall structure, significantly reduces manufacturing cost and equipment failure rate.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, and in particular to a lowering device and bridge erecting machine suitable for the construction of segmental beam bridges with variable spans. Background Technology

[0002] In the erection process of cast-in-place or precast segmental beams, bridge erecting machines are commonly used as the core construction equipment. The standard construction process is as follows: First, using the overhead crane assembly and lifting system of the bridge erecting machine, each segment of the beam is sequentially hoisted into position and temporarily tensioned, allowing the entire span of the beam to initially form a unified structure. Subsequently, a dedicated lowering device needs to be connected to the beam, bearing the entire beam load, to facilitate the threading and tensioning of the prestressed steel strands, and the final precise placement and system conversion of the beam. In this process, the lowering device is a key functional component that enables the bridge to transition from temporary fixation to permanent load-bearing; however, due to the diverse span types of bridges, the lowering device needs to be frequently moved to different span locations to adapt to construction requirements.

[0003] However, in existing technologies, lowering devices typically lack self-propelled capabilities or require a separate drive system (such as a motor and reducer). The former leads to difficulties in moving the spreader, heavily relies on manual assistance, is inefficient, and poses safety risks; the latter, while enabling movement, increases the manufacturing cost, complexity, and failure rate of the equipment, while also raising operation and maintenance costs.

[0004] Therefore, there is an urgent need to develop a self-propelled, simple, and low-cost lowering device to meet the needs of variable-span segmental beam bridge construction. Utility Model Content

[0005] This utility model proposes a lowering device and bridge erecting machine suitable for the construction of segmental beam bridges with variable spans. It solves the problems of complex equipment structure and high cost caused by configuring a separate independent drive system for the lowering device to meet the needs of the construction of segmental beam bridges with variable spans in the existing technology.

[0006] The technical solution of this utility model is implemented as follows: The first aspect of this utility model provides a lowering device suitable for the construction of variable span segmental beam bridges, comprising: The main body of the device is installed on the main beam of the bridge erecting machine; A connecting frame is rotatably mounted on one end of the device body for detachable connection with the overhead crane assembly of the bridge erecting machine; The walking component is rotatably mounted on the other end of the device body and has a retracted state and an extended state. The first drive mechanism, mounted on the device body, is used to drive the connecting frame to rotate in order to connect or disconnect from the crane assembly; The second drive mechanism, mounted on the device body, is used to drive the walking component to rotate to switch between a retracted state and an extended state.

[0007] Specifically, the first driving mechanism is a first hydraulic cylinder, one end of which is hinged to the device body and the other end is hinged to the tail end of the connecting frame; the middle part of the connecting frame is hinged to the device body, and the front end is detachably connected to the connecting seat of the overhead crane assembly through a connecting piece.

[0008] Furthermore, the connector is a snap-fit ​​pin, and the top surface of the connector seat is provided with a slot that matches the snap-fit ​​pin.

[0009] Specifically, the second driving mechanism is a second hydraulic cylinder, one end of which is hinged to the device body and the other end is hinged to the rear end of the walking component, and the front end of the walking component is hinged to the device body.

[0010] Furthermore, the walking assembly includes a frame and walking wheels mounted at the rear bottom of the frame.

[0011] Specifically, the device body includes a crossbeam, on which a hanging plate is installed, and at the bottom of the hanging plate is a hanger for connecting segmental beams; at the bottom of both ends of the crossbeam are end beams, which are installed on the main beam of the bridge erecting machine, and the connecting frame and the traveling assembly are respectively installed at both ends of the end beams.

[0012] A second aspect of this utility model provides a bridge erecting machine, including a main beam, a trolley assembly, a lifting device, and a lowering device, wherein the lowering device is configured to: When it is necessary to switch to the walking mode, the first drive mechanism drives the connecting frame to rotate and connect with the overhead crane assembly; at the same time, the second drive mechanism drives the walking assembly to unfold so that its walking wheels are supported on the main beam track, and the overhead crane assembly pulls the lowering device to move along the main beam track. When it is necessary to switch to the load-bearing state, the second drive mechanism drives the walking component to retract; at the same time, the first drive mechanism drives the connecting frame to rotate and disengage from the overhead crane component, so that the lowering device is supported on the main beam of the bridge erecting machine through its end beam.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model, through the design of a unique structure in which the connecting frame and the traveling component work together, and by using the first and second drive mechanisms to control their state switching respectively, enables the lowering device to be moved by the crane without having its own traveling power source. This effectively simplifies the overall structure, significantly reduces manufacturing costs and equipment failure rate, and at the same time realizes the conversion between the rapid and flexible displacement and reliable bearing state of the lowering device in variable span construction, greatly improving the construction efficiency and safety of segmental beam erection. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0015] Figure 1 This is a side view of a lowering device applicable to the construction of segmental beam bridges with variable spans, according to this utility model.

[0016] Figure 2 This is a front view of a lowering device applicable to the construction of variable span segmental beam bridges according to this utility model.

[0017] Figure 3 This is a schematic diagram of the structure of the lowering device switching to the bearing state in an embodiment of this utility model.

[0018] Figure 4 This is a schematic diagram of the structure of the lowering device switching to the walking state in an embodiment of this utility model.

[0019] Figure 5 This is a schematic diagram of the bridge erecting machine in different construction states in the embodiments of this utility model.

[0020] In the figure: 1. Device body; 2. Main beam; 3. Connecting frame; 4. Crane assembly; 5. Traveling assembly; 6. First drive mechanism; 7. Second drive mechanism; 8. Connecting piece; 9. Connecting seat; 10. Chassis; 11. Traveling wheel; 12. Crossbeam; 13. Hanging plate; 14. Suspension; 15. End beam. Detailed Implementation

[0021] The technical solution of this utility model will be clearly and completely described below with reference to its embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] It should be noted that in the description of this utility model, the terms "front end", "rear end", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] Reference Figures 1 to 4The first aspect of this utility model provides a lowering device suitable for the construction of segmental beam bridges with variable spans, comprising: The main body of the device 1 is installed on the main beam 2 of the bridge erecting machine; The connecting frame 3 is rotatably mounted on one end of the device body 1 and is used for detachable connection with the overhead crane assembly 4 of the bridge erecting machine; The walking component 5 is rotatably mounted on the other end of the device body 1 and has a retracted state and an unfolded state. The first drive mechanism 6 is installed on the device body 1 and is used to drive the connecting frame 3 to rotate so as to connect or disconnect from the crane assembly 4. The second drive mechanism 7 is installed on the device body 1 and is used to drive the walking component 5 to rotate to switch between the retracted state and the unfolded state.

[0024] This invention features a unique structure in which the connecting frame 3 and the traveling component 5 work together, and utilizes the first and second drive mechanisms 7 to control their state switching respectively. This allows the lowering device to be moved by the overhead crane without its own power source, effectively simplifying the overall structure, significantly reducing manufacturing costs and equipment failure rate. At the same time, it enables the lowering device to switch between rapid and flexible displacement and reliable load-bearing state during variable span construction, greatly improving the construction efficiency and safety of segmental beam erection.

[0025] The connecting frame 3 is a key component for connecting the lowering device to the overhead crane. It is hinged to one end of the device body 1 (usually located at the top of one end of the crossbeam 12) via a first rotation center (e.g., a heavy-duty pin), allowing the connecting frame 3 to rotate vertically around this hinge point. The main body of the connecting frame 3 is typically lever-shaped (triangular in this embodiment), with its middle section hinged to the device body 1. Its front end (free end) is equipped with a dedicated connector 8 for quick and reliable connection and disconnection with the connecting seat 9 at the bottom of the overhead crane assembly 4.

[0026] Specifically, the first drive mechanism 6 is a first hydraulic cylinder. The tail of the first hydraulic cylinder is hinged to the crossbeam 12 of the device body 1 via a pin, and the end of its piston rod is hinged to the tail end of the connecting frame 3. By controlling the extension and retraction of the first hydraulic cylinder through the hydraulic system, the connecting frame 3 can be driven to rotate downward (so that its front end aligns with the overhead crane connecting seat 9) or upward (so that its front end separates from the overhead crane connecting seat 9) around its first rotation center. This combination of lever and cylinder can generate sufficient torque with a small cylinder stroke, achieving stable and reliable connection and disengagement actions.

[0027] Furthermore, the connector 8 at the front end of the connecting frame 3 can be specifically defined as a downwardly protruding pin; correspondingly, the top surface of the connecting seat 9 of the crane assembly 4 is provided with a slot that matches the shape and size of the pin; when the connecting frame 3 rotates downward under the drive of the hydraulic cylinder, the pin is precisely embedded in the slot, thereby realizing the mechanical interlock between the two; this pin-slot connection method has a simple structure, reliable connection, and good traction force transmission effect.

[0028] The walking assembly 5 is the core component that enables the device to move on its own. It is hinged to the other end of the device body 1 (the end away from the connecting frame 3) via a second rotation center (e.g., a heavy-duty pin), allowing the walking assembly 5 to be retracted and extended around this hinge point. In the retracted state, the walking assembly 5 does not interfere with the load-bearing capacity; in the extended state, its end wheels 11 are supported on the track of the main beam 2 of the bridge erecting machine, providing support for movement.

[0029] Specifically, the second drive mechanism 7 is a second hydraulic cylinder. The tail of the cylinder body is hinged to the device body 1 via a pin, and the end of its piston rod is hinged to the rear end of the walking assembly 5 (the rear of the frame 10). By controlling the extension and retraction of the second hydraulic cylinder through the hydraulic system, the entire walking assembly 5 can be driven to unfold downwards or fold up and retract around its second rotation center.

[0030] Furthermore, the traveling assembly 5 includes a rigid frame 10, the front end of which is hinged to the device body 1, forming a second rotation center. At least one pair of traveling wheels 11 are installed at the rear bottom of the frame 10; when the second hydraulic cylinder extends, it pushes the rear of the frame 10 downward, so that the traveling wheels 11 are finally and stably pressed against the top surface of the track of the main beam 2 of the bridge erecting machine, ready to bear the load and roll. When the cylinder retracts, it pulls up the rear of the frame 10, so that the traveling wheels 11 are completely removed from the track, and the entire traveling assembly 5 is retracted to avoid interference with the structure of the main beam 2 under load.

[0031] The first drive mechanism 6 and the second drive mechanism 7 (i.e., the first and second hydraulic cylinders) of this utility model can share the same set of hydraulic pump station and control system, which simplifies the pipeline layout and reduces costs and maintenance complexity.

[0032] Specifically, the device body 1 includes a crossbeam 12, which has sufficient strength and rigidity to withstand the huge load of the segmental beam; two vertical hanging plates 13 are installed on the crossbeam 12, and the bottom of the hanging plates 13 is provided with a suspension 14 for connecting the segmental beam; end beams 15 are provided at the bottom of both ends of the crossbeam 12, and the end beams 15 are installed on the main beam 2 of the bridge erecting machine, and the connecting frame 3 and the traveling assembly 5 are respectively installed at both ends of the end beams 15; in the load-bearing state, the entire load of the lowering device and the entire beam is transferred to the main beam 2 of the bridge erecting machine through these two end beams 15, forming a stable support.

[0033] like Figure 5 As shown, the second aspect of this utility model provides a bridge erecting machine, including a main beam 2, a crane assembly 4, a lifting device, and the lowering device, wherein the lowering device is configured as follows: When it is necessary to switch to the walking mode, the first drive mechanism 6 drives the connecting frame 3 to rotate and connect with the crane assembly 4; at the same time, the second drive mechanism 7 drives the walking assembly 5 to unfold so that its walking wheels 11 are supported on the main beam 2 track, and the crane assembly 4 pulls the lowering device to move along the main beam 2 track. When it is necessary to switch to the load-bearing state, the second drive mechanism 7 drives the walking component 5 to retract; at the same time, the first drive mechanism 6 drives the connecting frame 3 to rotate and disengage from the overhead crane component 4, so that the lowering device is supported on the main beam 2 of the bridge erecting machine through its end beam 15.

[0034] The structural diagrams of the bridge erecting machine in different construction states are shown below. Figure 5 As shown, Figure 5 In the diagram, (a) represents the pre-tensioning state of the bridge erecting machine, where the gantry crane assembly 4 and the lifting system are used to hoist each segment of the beam into place and perform temporary tensioning, so that the entire span of the beam initially forms a whole; (b) represents the state of the lowering device being connected and in place, where the lowering device's hanging 14 is connected to the beam, and the lowering device bears the entire load of the beam; the process from state (a) to state (b) requires the use of the gantry crane assembly 4 to pull the two lowering devices to both ends of the beam respectively; (c) represents the state of permanent tensioning achieved by threading the steel strands, where the threading and permanent tensioning of the prestressed steel strands have been completed; (d) represents the state of the lowering device being lowered into place, where the beam has been lowered onto the pier by the lowering device, and the entire load of the beam has been transferred to the pier.

[0035] The working principle and process of this utility model are as follows: When the lowering device needs to be switched to the traveling state: the control system first commands the second drive mechanism 7 (second hydraulic cylinder) to actuate, driving the traveling component 5 to rotate downwards around its hinge point and unfold until its traveling wheels 11 are stably supported on the main beam 2 track. Simultaneously, the control system commands the first drive mechanism 6 (first hydraulic cylinder) to actuate, driving the connecting frame 3 to rotate downwards around its hinge point, causing its front end pin to accurately fall into the slot of the overhead crane component 4 connecting seat 9, achieving a rigid connection. At this time, the load of the lowering device is transferred to the traveling wheels 11 and connected to the overhead crane through the connecting frame 3. The overhead crane travel is initiated, and the traction force of the overhead crane is transmitted to the entire lowering device through the connecting frame 3, causing it to move along the main beam 2 track to the target work position.

[0036] When it is necessary to switch the lowering device to the load-bearing state: After the overhead crane pulls the lowering device to the target position, the control system commands the first drive mechanism 6 (first hydraulic cylinder) to retract, pulling the connecting frame 3 to rotate upward, causing its front end pin to disengage from the slot of the connecting seat 9, thereby disconnecting the power connection with the overhead crane. At the same time, the control system commands the second drive mechanism 7 (second hydraulic cylinder) to retract, pulling the traveling assembly 5 to rotate upward and retract, causing its traveling wheels 11 to completely leave the track. Finally, the lowering device, through the end beams 15 at both ends of its device body 1, is stably supported on the upper surface of the main beam 2 of the bridge erecting machine, entering a stable load-bearing state, ready for the tensioning and lowering operation of the segmental beam.

[0037] This invention, through the combination of the aforementioned ingenious mechanical structure and hydraulic drive system, successfully enables the lowering device to be moved by a crane without requiring its own driving power, thus perfectly solving the various drawbacks of existing technologies where the lowering device is difficult to move or requires an additional independent drive system.

[0038] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A lowering device suitable for the construction of segmental beam bridges with variable spans, characterized in that, include: The main body of the device (1) is installed on the main beam (2) of the bridge erecting machine; The connecting frame (3) is rotatably mounted on one end of the device body (1) for detachable connection with the overhead crane assembly (4) of the bridge erecting machine; The walking component (5) is rotatably mounted on the other end of the device body (1) and has a retracted state and an unfolded state; The first drive mechanism (6) is installed on the device body (1) and is used to drive the connecting frame (3) to rotate so as to connect or disconnect with the crane assembly (4); The second drive mechanism (7) is installed on the device body (1) and is used to drive the walking component (5) to rotate to switch between the retracted state and the unfolded state.

2. The lowering device for construction of segmental beam bridges with variable spans as described in claim 1, characterized in that, The first drive mechanism (6) is a first hydraulic cylinder. One end of the first hydraulic cylinder is hinged to the device body (1), and the other end is hinged to the tail end of the connecting frame (3). The middle part of the connecting frame (3) is hinged to the device body (1), and the front end is detachably connected to the connecting seat (9) of the crane assembly (4) through the connecting piece (8).

3. The lowering device for construction of variable span segmental beam bridges as described in claim 2, characterized in that, The connector (8) is a locking pin, and the top surface of the connector (9) is provided with a locking groove that matches the locking pin.

4. The lowering device for construction of segmental beam bridges with variable spans as described in claim 1, characterized in that, The second drive mechanism (7) is a second hydraulic cylinder. One end of the second hydraulic cylinder is hinged to the device body (1), and the other end is hinged to the rear end of the walking component (5). The front end of the walking component (5) is hinged to the device body (1).

5. The lowering device for construction of variable span segmental beam bridges as described in claim 4, characterized in that, The walking assembly (5) includes a frame (10) and a walking wheel (11) mounted on the bottom of the rear end of the frame (10).

6. The lowering device for construction of segmental beam bridges with variable spans as described in claim 1, characterized in that, The device body (1) includes a crossbeam (12), on which a hanging plate (13) is installed. The bottom of the hanging plate (13) is provided with a hanging device (14) for connecting segment beams. The bottom of both ends of the crossbeam (12) is provided with end beams (15), which are installed on the main beam (2) of the bridge erecting machine. The connecting frame (3) and the traveling assembly (5) are respectively installed at both ends of the end beams (15).

7. A bridge erecting machine, characterized in that, Includes a main beam (2), a crane assembly (4), a lifting device, and a lowering device as described in any one of claims 1 to 6, wherein the lowering device is configured to: When it is necessary to switch to the walking state, the first drive mechanism (6) drives the connecting frame (3) to rotate and connect with the crane assembly (4); at the same time, the second drive mechanism (7) drives the walking assembly (5) to unfold so that its walking wheels (11) are supported on the main beam (2) track, and the crane assembly (4) pulls the lowering device to move along the main beam (2) track; When it is necessary to switch to the load-bearing state, the second drive mechanism (7) drives the walking assembly (5) to retract; at the same time, the first drive mechanism (6) drives the connecting frame (3) to rotate and disengage from the overhead crane assembly (4), so that the lowering device is supported on the main beam (2) of the bridge erecting machine through its end beam (15).

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