Rotatable cantilever crane for bridge section erection

Abstract

The utility model discloses a rotatable cantilever crane for erecting bridge segments, and belongs to the technical field of bridge construction equipment. The rotatable cantilever crane for bridge segment erection comprises a main framework, a crane carriage, a rotating mechanism and a lifting appliance, the main framework comprises two longitudinal main beams, a front cross beam and a rear cross beam are connected between the two longitudinal main beams, and a middle stand column and a rear stand column are connected to the lower portions of the middles and the lower portions of the rear ends of the longitudinal main beams correspondingly; the lower end of the middle stand column and the lower end of the rear stand column are both fixedly connected with the bottom frame, the bottom frame is movably matched with the walking track, supporting jacks are arranged on the lower portion of the front end and the lower portion of the rear end of the bottom frame, and a first main inclined supporting rod and a second main inclined supporting rod are detachably connected between the longitudinal main beam and the bottom frame. The hoisting trolley is movably arranged between the two longitudinal main beams, the lifting appliances are connected to the lower portion of a winch pulley block of the hoisting trolley through rotating mechanisms, and leveling jacks are arranged on the lifting appliances.

Description

Technical Field

[0001] This utility model relates to a rotatable cantilever crane for bridge segment erection, belonging to the technical field of bridge construction equipment. Background Technology

[0002] The main span of the Wuhai Yellow River Grand Bridge is an (80+80+310+80+80)m hybrid beam cable-stayed bridge. It is a double-tower, double-cable-stayed steel box girder railway cable-stayed bridge. The main girder adopts a pneumatically designed single-box, five-cell, gem-shaped cross-section. The middle steel box girder segment is 390.0m long, and the concrete box girder segments at both ends are 121.2m long. A steel-concrete composite section is set between the steel box girder and the concrete beam. The mid-span steel box girder requires hoisting and cantilever assembly. Due to the width limitation of the steel box girder, it cannot be directly hoisted and installed into place.

[0003] Traditional cantilever cranes typically employ a truss frame structure with a fixed lifting device at the top, a traveling device at the bottom, and a water tank at the rear for added stability against overturning. This type of traditional cantilever crane is generally suitable for floating steel box girder construction. However, it lacks a lifting trolley capable of longitudinal and lateral movement at the top, resulting in significant limitations in its use, relatively poor maneuverability, limited applicability, and complex installation and dismantling. Utility Model Content

[0004] To address the aforementioned deficiencies in the existing technology, this utility model provides a rotatable cantilever crane for bridge segment erection. It is highly adaptable and easy to construct. It can solve the problem that the steel box girder cannot be directly hoisted and installed into place due to the width of the steel box girder during assembly, and it is also easy to install and dismantle.

[0005] This utility model is achieved through the following technical solution: a rotatable cantilever crane for bridge segment erection, characterized in that it includes a main frame, a lifting trolley, a rotating mechanism, and a lifting device. The main frame includes two parallel longitudinal main beams, with a front crossbeam and a rear crossbeam respectively connecting the front and rear ends of the two longitudinal main beams. A rear column is connected to the lower part of the rear end of the longitudinal main beam, and a middle column is connected to the lower part of the middle section of the longitudinal main beam. The front end of the longitudinal main beam is cantilevered. The lower ends of the middle column and the rear column are fixedly connected to the bottom frame. The bottom frame is movably fitted with traveling tracks provided on both sides of its bottom. The front end of the bottom frame... Support jacks are provided at the lower part and the lower rear part. A first main diagonal brace is detachably connected between the middle part of the longitudinal main beam and the rear end of the bottom frame on the same side. A second main diagonal brace is detachably connected between the front part of the longitudinal main beam and the front end of the bottom frame on the same side. The lifting trolley is movably set between the two longitudinal main beams. The lifting device is connected to the lower part of the winch pulley block of the lifting trolley through a rotating mechanism. The lifting device includes an upper flat beam connected to the rotating mechanism and two lower flat beams hinged to the lower ends of the upper flat beam. Connecting lugs are provided at the bottom of both ends of the lower flat beams. Leveling jacks are provided on both the upper flat beam and the lower flat beam.

[0006] In this invention, the main frame can move along a traveling track, and support jacks at the bottom of the main frame provide support. The lifting trolley can move along the longitudinal main beam of the main frame. The lifting device connected to the lower part of the winch pulley block of the lifting trolley can be connected to the lifting lugs on the steel box girder segment via connecting lugs at the bottom of the lower spreader beam. The lifting device can drive the steel box girder segment to rotate via a rotating mechanism connected to it. Leveling jacks on the lifting device are used to adjust the tilt angle of the steel box girder, facilitating the connection of beam segments. When assembling steel box girders using this invention, the steel box girder segments to be assembled can be lifted to the bridge deck by a beam lifting machine. The transverse direction of the steel box girder segments is placed on a beam transport trolley on the bridge deck, and then transported to the cantilever crane by the beam transport trolley. The beam is then lifted and transported to the cantilever crane's cantilever position by a lifting trolley. Finally, the steel box girder segments are rotated 90° by a rotating mechanism before assembly. This "beam-on-beam transport" method solves the problem that steel box girders cannot be directly hoisted and installed due to the width of the steel box girder.

[0007] Furthermore, the lower part of the upper flat beam is equipped with multiple connecting lugs, and the lower flat beam is connected to the upper flat beam through these connecting lugs. By providing multiple connecting lugs at the lower part of the upper flat beam, the installation position of the lower flat beam can be adjusted, accommodating the hoisting of beam segments with different center of gravity positions.

[0008] Furthermore, for ease of movement, a traveling jack connects the bottom frame and the traveling rail. The traveling jack allows the crane to be moved along the traveling rail.

[0009] Furthermore, to improve the overall structural strength of the main frame, at least one auxiliary connecting rod is detachably connected between the longitudinal main beam and the first and second main diagonal braces on the same side.

[0010] Furthermore, to improve the overall structural strength of the main frame, diagonal bracing rods are detachably connected between the longitudinal main beam and the front and rear crossbeams.

[0011] Furthermore, to ensure construction safety, guardrails are installed on the outer sides of both longitudinal main beams.

[0012] The beneficial effects of this utility model are as follows: The rotatable cantilever crane of this utility model can lift and transport beams via its lifting trolley, transporting steel box girders to the assembly position. The position of the steel box girder can be easily adjusted via the lifting trolley, facilitating the assembly of the steel box girder and reducing construction difficulty. The specially designed lifting device can not only be easily connected or disassembled with the steel box girder, but also the tilt angle of the steel box girder can be adjusted via the leveling jacks on the lifting device, facilitating beam segment docking, greatly reducing construction difficulty and improving construction accuracy. The rotating mechanism connected to the lifting device can easily drive the steel box girder to rotate, realizing the conversion between the steel box girder transportation state and docking state, solving the problem that the width of the steel box girder exceeds the internal width of the cantilever crane and cannot be directly transported. In this utility model, the longitudinal main beams of the main frame and the bottom frame, as well as the longitudinal main beams and other components, are all connected by detachable rods. This structural form not only has high structural strength, effectively meeting the structural strength requirements of the crane, but also facilitates installation and disassembly, accelerating the construction progress. Compared with traditional cantilever cranes, the rotatable cantilever crane of this invention has better mobility and adjustment capabilities, a wider range of applications, and is more convenient to use for construction. Attached Figure Description

[0013] Figure 1 This is a structural schematic diagram of the rotatable cantilever crane of this utility model;

[0014] Figure 2 yes Figure 1 A schematic diagram of the AA direction in the middle;

[0015] Figure 3 yes Figure 1 A schematic diagram of the BB-direction structure in the middle;

[0016] Figure 4 yes Figure 1 A schematic diagram of the CC-direction structure in the middle;

[0017] Figure 5 yes Figure 1 An enlarged schematic diagram of the crane trolley section;

[0018] Figure 6This is a schematic diagram of the connection structure between the rotating mechanism and the lifting device of the rotatable cantilever crane in this utility model;

[0019] Figure 7 This is a schematic diagram of the connection structure between the rotating shaft of the rotating mechanism and the winch trolley block in this utility model;

[0020] Figure 8 yes Figure 3 An enlarged schematic diagram of part D in the diagram;

[0021] Figure 9 yes Figure 4 An enlarged schematic diagram of part E in the diagram;

[0022] Figure 10 This is a schematic diagram showing the overall forward movement of steel box girder segments during construction using a rotatable cantilever crane;

[0023] Figure 11 This is a schematic diagram showing the overall rotation of a steel box girder segment during construction using a rotatable cantilever crane;

[0024] Figure 12 This is a schematic diagram illustrating the overall positioning of steel box girder segments during construction using a rotatable cantilever crane;

[0025] In the diagram, 1. Bottom frame, 2. Traveling track, 3. Completed beam segment, 4. First main diagonal brace, 5. Rear column, 6. Secondary connecting rod between the longitudinal main beam and the first main diagonal brace, 7. Guardrail, 8. Longitudinal main beam, 9. Secondary connecting rod between the longitudinal main beam and the second main diagonal brace, 10. Lifting trolley, 11. Winch pulley block, 12. Rotating mechanism, 13. Second leveling jack, 14. Lifting device, 15. Second main diagonal brace, 16. Central column, 17. Traveling jack, 18. Steel box girder segment to be erected, 19. Front crossbeam, 20. Rear crossbeam, 21. Diagonal brace between the longitudinal main beam and the rear crossbeam, 22. Diagonal brace between the longitudinal main beam and the front crossbeam, 23. Rear support jack, 24. Lateral movement jack, 25. First leveling jack, 26. Front support jack;

[0026] 10-1. Crane trolley crossbeam; 10-2. Winch; 10-3. Wheel box; 10-4. Winch frame; 10-5. Winch wire rope.

[0027] 11-1. Base plate of winch pulley block;

[0028] 12-1. Rotary motor; 12-2. Small gear; 12-3. Large gear; 12-4. Rotating shaft;

[0029] 14-1 Upper flat beam, 14-2 Lower flat beam, 14-3 Connecting lug at the bottom of the upper flat beam, 14-4 Connecting lug at the bottom of the lower flat beam. Detailed Implementation

[0030] The present invention will be further described below through non-limiting embodiments and in conjunction with the accompanying drawings:

[0031] As shown in the attached figure, a rotatable cantilever crane for bridge segment erection includes a main frame, a lifting trolley 10, a rotating mechanism 12, and a lifting device 14. The main frame includes a bottom frame 1, an upper frame, a central column 5 connecting the bottom frame 1 and the upper frame, and a rear column 16. The bottom frame 1 includes longitudinal bottom beams on both sides and transverse bottom beams connecting the front ends of the two longitudinal bottom beams. The upper frame includes two parallel longitudinal main beams 8, with a front transverse beam 19 connecting the front ends of the two longitudinal main beams 8 and a rear transverse beam 20 connecting the rear ends of the two longitudinal main beams 8. Diagonal braces 22 are detachably connected between the longitudinal main beams 8 and the front transverse beam 19, and diagonal braces 21 are detachably connected between the longitudinal main beams 8 and the rear transverse beam 20. A rear column 5 is connected to the lower rear end of each longitudinal main beam 8. A central column 16 is connected to each of the lower parts of the main frame 8. The front end of the longitudinal main beam 8 is cantilevered. The lower ends of the central column 16 and the rear column 5 are fixedly connected to the bottom frame 1. A first main diagonal brace 7 is detachably connected between the middle part of the longitudinal main beam 8 and the rear end of the bottom frame 1 on the same side. A second main diagonal brace 15 is detachably connected between the front part of the longitudinal main beam 8 and the front end of the bottom frame 1 on the same side. To ensure the structural strength of the main frame, at least one auxiliary connecting rod 6 is detachably connected between the longitudinal main beam 8 and the first main diagonal brace 4 on the same side, and at least one auxiliary connecting rod 9 is detachably connected between the longitudinal main beam 8 and the second main diagonal brace 15 on the same side. The bottom frame 1 is movably connected to the traveling rails 2 set on both sides of its bottom. The bottom frame 1 can move along the traveling rails 2 under the action of external force. In this embodiment, a traveling jack 17 is set between the bottom frame 1 and the traveling rails 2, which can push the entire crane to move. Front support jacks 26 are installed on both sides of the lower front end of the bottom frame 1, and rear support jacks 23 are installed on both sides of the lower rear end of the bottom frame 1. The crane can be supported by the front support jacks 26 and the rear support jacks 23. The trolley 10 is movably mounted between two longitudinal main beams 8. The trolley 10 is existing technology. The trolley 10 mainly includes a trolley crossbeam 10-1, a winch 10-2, and a winch frame 10-4. The winch frame 10-4 is mounted on the upper part of the trolley crossbeam 10-1, and the winch 10-2 is mounted on the upper part of the winch frame 10-4. Wheel boxes 10-3 are provided at the lower parts of both ends of the trolley crossbeam 10-1. Both ends of the trolley crossbeam 10-1 are respectively connected to the guide rails provided at the top of the two longitudinal main beams 8 through the wheel boxes 10-3 at the lower part of the trolley crossbeam 10-1. The trolley 10 can travel along the guide rails at the top of the longitudinal main beams 8 through the wheel boxes 10-3 at the lower part of the trolley crossbeam 10-1. To facilitate the adjustment of the winch position, a horizontal jack 24 is also installed on the lifting trolley beam 10-1 and connected to the winch frame 10-4.The lifting device 14 is connected to the lower part of the winch trolley block 11 of the lifting trolley 10 via a rotating mechanism 12. The lifting device 14 includes an upper flat beam 14-1 and two lower flat beams 14-2 hinged to the lower part of the upper flat beam 14-1. The middle part of the upper flat beam 14-1 is connected to the rotating mechanism 12, and the two lower flat beams 14-2 are respectively connected to the lower ends of the upper flat beam 14-1. Connecting lugs 14-4 are respectively provided at the bottom ends of the lower flat beams 14-2. The connecting lugs 14-4 are used to connect with the lifting lugs provided on the steel box girder to be erected. To adapt to the lifting of beam segments with different center of gravity positions, it is preferable to provide multiple connecting lugs 14-3 at the lower part of the upper flat beam 14-1. The lower flat beams 14-2 are connected to the upper flat beam 14-1 through the connecting lugs 14-3 at the lower part of the upper flat beam. The connecting lugs 14-3 at different positions can be selected for connection according to the center of gravity of the beam segment being lifted. To facilitate the adjustment of the inclination of the hoisted steel box girder and the connection of the steel box girder, this utility model is equipped with a first leveling jack 25 on the upper flat beam 14-1 and a second leveling jack 13 on the lower flat beam 14-2. One end of the first leveling jack 25 is connected to the upper flat beam 14-1, and the other end is connected to the connector of the upper flat beam 14-1. One end of the second leveling jack 13 is connected to the lower flat beam 14-2, and the other end is connected to the upper flat beam 14-1. The inclination angle of the beam segment can be adjusted by the first leveling jack 25 and the second leveling jack 13, and the inclination angle of the beam segment can be adjusted by ±2%. The rotating mechanism 12 in this utility model is used to drive the lifting device to rotate. The rotating mechanism 12 can adopt any rotating structure that can drive the lifting device to rotate in the prior art. In this embodiment, the rotating mechanism 12 adopts a gear transmission structure, which includes two rotating motors 12-1, two small gears 12-2, a large gear 12-3, and a rotating shaft 12-4. The rotating shaft 12-4 is rotatably connected to the lower part of the bottom plate 11-1 of the winch trolley block. The large gear 12-3 is mounted on the rotating shaft 12-4. The two rotating motors 12-1 are symmetrically installed on both sides of the winch trolley block 11. The two small gears 12-2 are respectively installed on the motor shafts of the two rotating motors 12-1. Both small gears 12-2 mesh with the large gear 12-3. The lower end of the rotating shaft 12-4 is connected to the lifting device 14. Two rotary motors 12-1 drive a large gear 12-3 to rotate via two small gears 12-2, which in turn drive the lifting device 14 to rotate 360° via the rotating shaft 12-4.

[0032] To ensure construction safety, guardrails 7 are installed on the outer sides of both longitudinal main beams 8 in this utility model.

[0033] When using the aforementioned rotatable cantilever crane to erect steel box girders, the steel box girders are hoisted and assembled in sections, which includes the following steps:

[0034] (1) Install the traveling rail 2 of the rotatable cantilever crane on both sides of the bridge deck;

[0035] (2) Install the rotatable cantilever crane on the running track 2 and anchor it to the bridge deck;

[0036] (3) The steel box girder segment to be erected is lifted to the bridge deck by the beam lifting machine. The steel box girder segment is placed on the beam transport trolley on the bridge deck in the transverse direction of the bridge and in the longitudinal direction of the bridge. The beam transport trolley transports the steel box girder segment to the rotatable cantilever crane. The lifting trolley 10 of the rotatable cantilever crane moves to the rear. After the lifting device 14 is connected to the steel box girder segment, it is lifted and moved forward. After the steel box girder segment is moved to the cantilever part of the main frame, it is lowered to the set height. The rotating mechanism 12 is started to slowly rotate the steel box girder segment by 90°.

[0037] (4) Rotate the steel box girder segment to the longitudinal direction of the bridge, and adjust the position of the steel box girder segment by moving the crane trolley 10 so that the steel box girder segment is close to the installed beam segment;

[0038] (5) Adjust the longitudinal slope and transverse levelness of the steel box girder by using the leveling jacks set on the lifting device 14, so that the longitudinal and transverse slopes of the steel box girder reach the design accuracy.

[0039] (6) Move the steel box girder segment by the crane trolley 10 to bring it close to the installed beam segment and put it in place. Install the matching bolts and tighten them to complete the installation of the beam segment.

[0040] The other parts in this embodiment are all existing technologies and will not be described in detail here.

Claims

1. A rotatable cantilever crane for erecting bridge segments, characterized in that: The system includes a main frame, a lifting trolley, a rotating mechanism, and a lifting device. The main frame comprises two parallel longitudinal main beams. A front crossbeam and a rear crossbeam are connected between the front and rear ends of the two longitudinal main beams, respectively. A rear column is connected to the lower rear end of each longitudinal main beam, and a central column is connected to the lower middle section of each longitudinal main beam. The front end of each longitudinal main beam is cantilevered. The lower ends of both the central and rear columns are fixedly connected to a bottom frame. The bottom frame is movably fitted with travel rails on both sides of its bottom. Support jacks are provided at the lower front and rear ends of the bottom frame. A first main diagonal brace is detachably connected between the middle part of the main beam and the rear end of the bottom frame on the same side. A second main diagonal brace is detachably connected between the front part of the longitudinal main beam and the front end of the bottom frame on the same side. The lifting trolley is movably set between the two longitudinal main beams. The lifting device is connected to the lower part of the winch trolley block of the lifting trolley through a rotating mechanism. The lifting device includes an upper flat beam connected to the rotating mechanism and two lower flat beams hinged to the lower ends of the upper flat beam. Connecting lugs are respectively provided at the bottom of the two ends of the lower flat beams. Leveling jacks are provided on both the upper flat beam and the lower flat beam.

2. The rotatable cantilever crane for bridge segment erection according to claim 1, characterized in that: The lower part of the upper flat beam is equipped with multiple connecting lugs, and the lower flat beam is connected to the upper flat beam through the connecting lugs at the lower part of the upper flat beam.

3. The rotatable cantilever crane for bridge segment erection according to claim 1, characterized in that: A traveling jack connects the bottom frame and the traveling track.

4. The rotatable cantilever crane for bridge segment erection according to claim 1, 2, or 3, characterized in that: At least one auxiliary connecting rod can be detachably connected between the longitudinal main beam and the first and second main diagonal braces on the same side.

5. The rotatable cantilever crane for bridge segment erection according to claim 4, characterized in that: The longitudinal main beam is detachably connected to the front crossbeam and the rear crossbeam by diagonal bracing.

6. The rotatable cantilever crane for bridge segment erection according to claim 1, 2, or 3, characterized in that: Guardrails are installed on the outer sides of both longitudinal main beams.

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