Overwater construction erecting mechanism and method for large-span suspension bridge stiffening beam

Abstract

The invention relates to a large-span suspension bridge stiffening beam overwater construction erecting mechanism and method, and belongs to the technical field of bridge construction. The construction erection mechanism comprises a travelling crane, wherein the travelling crane comprises a crane body and an extending section connected to the crane body; the lifting mechanism is connected to the extending section and comprises a clamping piece used for being connected with a sling and an upper cross beam connected to the clamping piece, and the upper cross beam is connected with a sling used for lifting the stiffening beam to be erected through a pulley block and a steel wire rope. According to the overwater construction erecting mechanism for the large-span suspension bridge stiffening beam, efficient and safe erecting of the stiffening beam is achieved through the moving function of the traveling crane and the lifting function of the lifting mechanism, and the overwater construction erecting mechanism can be widely applied to erecting of an overwater suspension bridge main beam. Compared with a traditional method for erecting by using a cable crane, the method has the advantages of being lighter, more economical, convenient to use, mount and dismount and the like.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to an overwater construction and erection mechanism and method for a stiffening beam of a large-span suspension bridge. Background Art

[0002] At present, suspension bridges have become the preferred bridge type for large-span bridges due to their large spanning capacity, good earthquake resistance, beautiful appearance, and economical cost.

[0003] Modern suspension bridges are generally flexible suspension systems consisting of foundations, anchors, main towers, main cables, slings, stiffening beams and other components. The stiffening beams of suspension bridges are generally rigid beams. Some small-span suspension bridges may use concrete beam structures, while large-span suspension bridges mainly use steel truss beams and steel box beam structures. The erection method of stiffening beams is affected by the terrain. For suspension bridges in mountainous areas, cable cranes are often used to lift stiffening beams at fixed points. For suspension bridges over water, cable-mounted cranes or bridge deck cranes are often used to vertically lift stiffening beams.

[0004] For long-span suspension bridges constructed on water, as the span becomes larger and larger, the main cable diameter becomes thicker and thicker, and even develops into a double main cable structure, the stiffening beam segment becomes heavier, making the cable-mounted crane or bridge crane structure more complicated, the rated lifting weight becomes larger, and the construction risk increases. At the same time, the cable-mounted crane or bridge crane itself is expensive, has poor reversibility, and is also very difficult to install and dismantle at high altitudes. Therefore, it is necessary to design a more economical and flexible stiffening beam erection mechanism to facilitate the erection of the stiffening beam of the suspension bridge and reduce construction costs and risks. Summary of the invention

[0005] The embodiment of the present application provides a mechanism and method for the overwater construction and erection of a stiffening beam of a large-span suspension bridge, so as to solve the problems of great construction difficulty and inconvenient operation in the overwater construction and erection of a stiffening beam in the related art.

[0006] In a first aspect, an embodiment of the present application provides a mechanism for erecting a large-span suspension bridge stiffening beam on water, comprising:

[0007] A traveling vehicle, comprising a vehicle body and an extension section connected to the vehicle body;

[0008] A lifting mechanism is connected to the extending section, and comprises a clamping member for connecting a sling, an upper crossbeam connected to the clamping member, and a sling for lifting the stiffening beam to be erected is connected to the upper crossbeam via a pulley block and a steel wire rope.

[0009] In some embodiments, the vehicle includes rollers fixed to the bottom of the vehicle body.

[0010] In some embodiments, the crane is connected to a winch for lifting and lowering the lifting mechanism.

[0011] In some embodiments, the crane includes a hydraulic rod connected to one end of the extending section for extending or retracting the extending section.

[0012] In some embodiments, the clamping member includes a fixing plate and bolts disposed on the fixing plate.

[0013] In some embodiments, the upper beam is rotatably connected to the extension section.

[0014] In some embodiments, the upper cross beam and the hanger are both steel box beams.

[0015] In some embodiments, a counterweight is provided at the end of the vehicle body.

[0016] In some embodiments, the vehicle body includes a plurality of triangular truss structures connected to each other.

[0017] In a second aspect, a method for erecting a large-span suspension bridge stiffening girder on water is provided, which is implemented by using the above-mentioned large-span suspension bridge stiffening girder on water construction erection mechanism, and includes the following steps:

[0018] Erect the first segment stiffening beam and transport the stiffening beam to be erected to the position just below the design position;

[0019] Use the crane to move along the erected stiffening beam to send the lifting mechanism to the designed position, extend the extension section, and fix the clamping parts of the lifting mechanism to the sling cable of the beam section to be erected;

[0020] Start the winch to lower the wire rope, lower the lifting device of the lifting mechanism to the beam surface of the stiffening beam to be erected, and connect and fix the lifting device to the stiffening beam to be erected;

[0021] Start the winch to retract the wire rope, drive the stiffening beam to be erected to rise, and after the stiffening beam to be erected is lifted to the target position, fix the stiffening beam to be erected and the sling;

[0022] Loosen the clamping parts of the lifting mechanism, retract the extended section, and erect the next section of stiffening beam.

[0023] The beneficial effects of the technical solution provided by this application include:

[0024] An embodiment of the present application provides an overwater construction and erection mechanism and method for stiffening beams of a large-span suspension bridge. The construction and erection mechanism of the present application includes a crane, which includes a body and an extended section connected to the body; a lifting mechanism, which is connected to the extended section and includes a clamping member for connecting a sling, and an upper crossbeam connected to the clamping member, and a lifting device for lifting the stiffening beam to be erected is connected to the upper crossbeam via a pulley block and a steel wire rope.

[0025] In actual use, after the first segment stiffening beam is erected, the crane can travel along the stiffening beam that has been added. The body is the basic part of the crane. It is set on the stiffening beam that has been added to provide stable support and positioning, ensure that the crane can move and adjust on it, and have a certain cantilever spanning capacity, so that it can send the lifting mechanism to the position of the sling of the beam section to be erected. The extension section is connected to one end of the body to form a retractable and rotatable structure. The extension section can increase the working range of the crane, allowing it to reach a farther area. By adjusting the length or angle of the extension section, it can meet the erection requirements of stiffening beams at different positions and angles. In addition, the lifting mechanism is connected to the extension section, and the clamping member of the lifting mechanism is used to fix and connect the sling to ensure that it will not fall off or loosen during the lifting process. The upper crossbeam is connected to the top of the clamping member to form the main supporting structure of the lifting mechanism. By retracting and releasing the wire rope, the lifting device and the stiffening beam to be erected can be lifted and lowered. The lifting device is connected to the end of the wire rope and is used to directly lift the stiffening beam to be erected. During the lifting process, the hoist bears the weight of the stiffening beam and lifts it safely to the designed position. The crane and the lifting mechanism together constitute an efficient and flexible stiffening beam erection system. The large-span suspension bridge stiffening beam water construction erection mechanism of the present application realizes the efficient and safe erection of the stiffening beam through the movement of the crane and the lifting function of the lifting mechanism, and can be widely used in the erection of the main beam of the water suspension bridge. Different from the traditional erection method using a cable-mounted crane, this patented method has the advantages of being more lightweight, economical, and easy to use, install and disassemble. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 A front view of the first segment stiffening beam during erection provided in an embodiment of the present application;

[0028] Figure 2 for Figure 1 Side view of

[0029] Figure 3 This is the main view of a construction step when erecting the first segment stiffening beam;

[0030] Figure 4 for Figure 3 Side view of

[0031] Figure 5 This is the main view after the erection of the first segment stiffening beam is completed;

[0032] Figure 6 for Figure 5 Side view of

[0033] Figure 7 This is a schematic diagram of the transportation of the stiffening beam to be erected;

[0034] Figure 8 It is a schematic diagram of the connection between the stiffening beam to be erected and the lifting mechanism;

[0035] Fig. 9 This is a schematic diagram of using a lifting mechanism to lift the stiffening beam to be erected;

[0036] Fig.10 This is a schematic diagram after the stiffening beam to be erected is lifted;

[0037] Fig.11 This is a schematic diagram of the erection of the stiffening beams when the erection work is completed;

[0038] Fig.12 It is a structural diagram of the crane and lifting mechanism;

[0039] Fig.13 It is a structural diagram of the crane and lifting mechanism;

[0040] Fig.14 for Fig.12 At the middle AA position, the side view of the crane and lifting mechanism during the erection of the stiffening beam;

[0041] Fig.15 for Fig.12 At the middle AA position, a top view of the crane and lifting mechanism during the erection of the stiffening beam;

[0042] Fig.16 for Fig.12 At AA in the middle, the side view of the crane and lifting mechanism in normal state;

[0043] Fig.17 for Fig.12 At AA in the middle, it is a top view of the crane and lifting mechanism in normal state;

[0044] Fig.18 for Fig.12 At the middle BB, the side view of the vehicle in motion;

[0045] Fig.19 for Fig.12 Side view of the crane and counterweight at the center CC;

[0046] Fig. 20 The figure is a flow chart of the construction method.

[0047] Reference numerals:

[0048] 1. First section stiffening beam; 2. Main cable; 3. Lifting rope; 4. Lifting mechanism; 5. Crane; 11. Erected stiffening beam; 12. Stiffening beam to be erected; 41. Upper cross beam; 42. Lifting device; 43. Clamping piece; 44. Pulley block; 45. Wire rope; 51. Carriage; 52. Roller; 53. Counterweight; 54. Winch; 55. Extended section. DETAILED DESCRIPTION

[0049] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0050] The embodiment of the present application provides a mechanism and method for the overwater construction and erection of stiffening girders of a large-span suspension bridge, which can solve the problems of great construction difficulty and inconvenient operation in the overwater construction and erection of stiffening girders in the related art.

[0051] See also Figures 7 to 11 As shown, on the one hand, an embodiment of the present application provides an overwater construction and erection mechanism for stiffening beams of a large-span suspension bridge, including a traveling crane 5, which includes a vehicle body 51 and an extending section 55 connected to the vehicle body 51; a lifting mechanism 4, the lifting mechanism 4 is connected to the extending section 55, and includes a clamping member 43 for connecting the sling 3, an upper crossbeam 41 connected to the clamping member 43, and a sling 42 for lifting the stiffening beam 12 to be erected is connected to the upper crossbeam 41 through a pulley block 44 and a steel wire rope 45.

[0052] In actual use, after the first segment stiffening beam 1 is erected, the traveling crane 5 can travel along the stiffening beam that has been added. The vehicle body 51 is the basic part of the traveling crane 5. It is arranged on the stiffening beam that has been added to provide stable support and positioning, ensuring that the traveling crane 5 can be moved and adjusted thereon, and has a certain cantilever spanning ability, so that it can send the lifting mechanism 4 to the position of the sling 3 of the beam section to be erected. The extension section 55 is connected to one end of the vehicle body 51 to form a retractable and rotatable structure. The extension section 55 can increase the working range of the traveling crane 5, so that it can reach a farther area. By adjusting the length or angle of the extension section 55, it can adapt to the erection requirements of stiffening beams at different positions and angles. In addition, the lifting mechanism 4 is connected to the extension section 55, and the clamping member 43 of the lifting mechanism 4 is used to fix and connect the sling 3 to ensure that it will not fall off or loosen during the lifting process. The upper crossbeam 41 is connected to the top of the clamping member 43 to form the main supporting structure of the lifting mechanism 4. By retracting and releasing the steel wire rope 45, the lifting and lowering of the sling 42 and the stiffening beam 12 to be erected can be realized. The sling 42 is connected to the end of the steel wire rope 45, and is used to directly lift the stiffening beam 12 to be erected. During the lifting process, the sling 42 bears the weight of the stiffening beam and safely lifts it to the designed position. The crane 5 and the lifting mechanism 4 together constitute an efficient and flexible stiffening beam erection system. The large-span suspension bridge stiffening beam water construction erection mechanism of the present application realizes the efficient and safe erection of the stiffening beam through the movement of the crane 5 and the lifting and lowering function of the lifting mechanism 4, and can be widely used in the erection of the main beam of the water suspension bridge. Different from the traditional erection method using a cable-mounted crane, the patented method has the advantages of being more lightweight, economical, and easy to use, install and disassemble.

[0053] In use, the upper cross beam 41 not only provides sufficient strength and rigidity to support the weight of the sling 42 and the stiffening beam 12 to be erected, but also serves as a fixing point for the pulley block 44 and the wire rope 45. The pulley block 44 is mounted on the upper cross beam 41 and is connected to the sling 42 through the wire rope 45. The main function of the pulley block 44 is to change the direction of the wire rope 45 and reduce the friction between the wire rope 45 and the upper cross beam 41. It allows the wire rope 45 to move smoothly during the lifting process, thereby improving the lifting efficiency and reducing wear, and can play a labor-saving role. The wire rope 45 passes through the pulley block 44, one end of which is connected to the sling 42, and the other end is connected to the winch 54 or other power source. The wire rope 45 is the core component of the lifting mechanism 4, which bears the entire weight of the sling 42 and the stiffening beam 12 to be erected, and transfers this weight to the winch 54.

[0054] In actual use, the erection mechanism of the present application can be symmetrically arranged in two groups, so as to facilitate the simultaneous water erection construction from both ends of the erected stiffening beam 11, which helps to improve the construction efficiency.

[0055] In some optional embodiments, such as Fig.18 and Fig.19 As shown, the trolley 5 includes a roller 52 fixed to the bottom of the body 51, and the roller 52 is fixed to the bottom of the body 51. In actual use, the arrangement of the roller 52 enables the trolley 5 to move on the added bridge deck, increasing its flexibility and scope of application. The body 51, as the basic part of the trolley 5, ensures the stability and load-bearing capacity of the entire structure.

[0056] In some optional embodiments, such as Fig.12 and Fig.13 As shown, the traveling crane 5 is connected with a winch 54 for lifting and lowering the lifting mechanism 4. The winch 54 is arranged on the traveling crane 5, and the winch 54 can be utilized to enhance its hoisting and handling capabilities, so that the traveling crane 5 can complete more complex operating tasks.

[0057] In some optional embodiments, such as Figures 14 to 17 As shown, the crane 5 includes a hydraulic rod connected to one end of the extended section 55, which is used to extend or retract the extended section 55. The crane 5 includes a hydraulic rod connected to one end of the extended section 55. The hydraulic rod is used to control the extension or retraction of the extended section 55. The extension of the extended section 55 can increase the working range of the crane 5, while the retraction can reduce its occupied space. As a power source, the hydraulic rod can accurately control the movement of the extended section 55 to achieve precise positioning and operation. In actual use, the extension of the hydraulic rod can contact the end of the extended section 55, so that the extended section 55 is retracted, thereby retracting the lifting mechanism 4. When it is necessary to lift the stiffening beam 12 to be erected, the hydraulic rod is retracted, so that the extended section 55 can be extended relative to the body 51 of the crane 5, thereby extending the lifting mechanism 4.

[0058] In some optional embodiments, the clamping member 43 includes a fixing plate and a bolt disposed on the fixing plate. The clamping member 43 is used to clamp the sling 3, so as to connect and fix the construction erection mechanism to the sling 3. The clamping member 43 includes a fixing plate and a bolt disposed on the fixing plate. The clamping member 43 is used to fix the clamped object. The fixing plate provides a stable support surface, and the bolt generates a clamping force by tightening, so that the object is firmly fixed on the clamping member 43. This design enables the clamping member 43 to be applicable to slings 3 of different shapes and sizes, and has a wide range of applicability.

[0059] In some optional embodiments, the upper crossbeam 41 is rotatably connected to the extension section 55. The upper crossbeam 41 is connected to the extension section 55 by a rotatable connection. The upper crossbeam 41 can rotate or swing relative to the extension section 55 within a certain range. This rotatable connection design allows the upper crossbeam 41 and the sling 42 connected thereto to be more flexibly adapted to different operational requirements. For example, when it is necessary to adjust the lifting angle or avoid obstacles, this can be achieved by rotating the upper crossbeam 41. This increases the flexibility and operating efficiency of the entire lifting system. In addition, this rotatable connection setting can also facilitate the retraction and extension of the lifting mechanism 4, and can avoid interference with other components.

[0060] In some optional embodiments, the upper cross beam 41 and the hanger 42 are both steel box beams. As the load-bearing structure of the lifting mechanism 4, the upper cross beam 41 is designed to meet the requirements of load-bearing capacity and stability. As a component that directly connects and lifts the stiffening beam 12 to be erected, the hanger 42 also needs to be strong enough. In this embodiment, the upper cross beam 41 and the hanger 42 both adopt a steel box beam structure. The steel box beam has the advantages of strong load-bearing capacity, light weight, and good wind resistance and stability, and is very suitable for this large bridge construction erection mechanism. The steel box beam structure enables the upper cross beam 41 and the hanger 42 to withstand huge loads, ensuring that no deformation or damage occurs during the lifting process. The steel box beam has a relatively light weight, which helps to reduce the weight of the entire erection mechanism and reduce the difficulty and risk of construction. The steel box beam has good wind resistance and stability, and can maintain the stability of the structure under severe weather conditions to ensure the safe progress of construction.

[0061] In some optional embodiments, such as Fig.19 As shown, a counterweight 53 is provided at the end of the vehicle body 51. The vehicle body 51 is the main part of the trolley 5, providing a stable support and a mobile platform. The counterweight 53 is connected to the end of the vehicle body 51, and is used to balance the weight of the entire trolley 5 to ensure its stability during movement. The counterweight 53 can increase the weight of the end of the vehicle body 51, thereby reducing the risk of shaking and tilting of the trolley 5 during movement. In actual use, by reasonably setting the weight and position of the counterweight 53, the stability of the trolley 5 can be further optimized and the construction safety can be improved.

[0062] In some optional embodiments, the vehicle body 51 includes a plurality of triangular truss structures connected to reduce deadweight. The vehicle body 51 is connected by a plurality of triangular truss structures. Each triangular truss structure is composed of three or more rods to form a stable triangular structure. These triangular truss structures are connected together through nodes to form an overall stable support structure. The triangular truss structure has good stability and load-bearing capacity and can withstand loads from all directions. By connecting a plurality of triangular truss structures, the overall stability and load-bearing capacity of the vehicle body 51 can be further enhanced. This structural design enables the vehicle body 51 to adapt to various complex construction environments and conditions, and ensures the stability and safety of the vehicle 5 during movement.

[0063] On the other hand, Fig. 20 The embodiment of the present application provides a method for erecting a large-span suspension bridge stiffening beam on water, which is implemented by using the above-mentioned large-span suspension bridge stiffening beam on water construction erection mechanism, and includes the following steps:

[0064] S1, erect the first segment stiffening beam 1, and transport the stiffening beam 12 to be erected to the position just below the design position;

[0065] S2, using the traveling crane 5 to move along the erected stiffening beam 11, the lifting mechanism 4 is sent to the designed position, the extension section 55 is extended, and the clamping member 43 of the lifting mechanism 4 is fixed to the sling 3 of the beam section to be erected;

[0066] S3, start the hoist 54 to lower the wire rope 45, lower the sling 42 of the lifting mechanism 4 to the beam surface of the stiffening beam 12 to be erected, and connect and fix the sling 42 to the stiffening beam 12 to be erected;

[0067] S4, start the winch 54 to retract the wire rope 45, drive the stiffening beam 12 to be erected to rise, and after the stiffening beam 12 to be erected is lifted to the target position, fix the stiffening beam 12 to be erected and the sling 3;

[0068] S5, release the clamping member 43 of the lifting mechanism 4, retract the extended section 55, and erect the next section of the stiffening beam.

[0069] In actual use, first, the stiffening beam to be erected is transported to the position directly below the designed position. Then, the crane 5 is used to move smoothly along the erected stiffening beam until the lifting mechanism 4 is accurately delivered to the predetermined designed position. At this time, the extension section 55 will extend so as to firmly fix the clamping member 43 of the lifting mechanism 4 on the sling 3.

[0070] Then, if Figures 8 to 11As shown, the winch 54 is started, and the wire rope 45 is lowered to slowly lower the sling 42 of the lifting mechanism 4 to the beam surface of the stiffening beam 12 to be erected. After ensuring that the sling 42 is stably connected and fixed to the stiffening beam 12 to be erected, the winch 54 is started again, and the wire rope 45 is retracted to smoothly lift the stiffening beam 12 to be erected.

[0071] After the stiffening beam 12 to be erected is lifted to the target position, it is immediately precisely adjusted and fixed to ensure that it is stably connected to the sling 3, thereby completing the entire erection process.

[0072] In step 1, if Figures 1 to 6 As shown, when erecting the first segment stiffening beam 1, after completing the construction of the main cable 2 and the sling 3 of the whole bridge, first assemble the first segment stiffening beam 1, the lifting mechanism 4 and the crane 5 at the assembly site, put the crane 5 on the first segment stiffening beam 1, fix the lifting device 42 of the lifting mechanism 4 to the first segment stiffening beam 1, and then transport it to the bottom of the bridge by barge, and finally install the fixed pulley on the cable clamp of the sling 3, and pass a set of temporary steel wire ropes 45. First, use the temporary steel wire rope 45 to lift the upper structure of the lifting mechanism 4, that is, the upper crossbeam 41, the clamping member 43, the pulley group 44 and other structures to the position of the sling 3, and then clamp the clamping member 43 and the sling 3 to fix them, and finally use the steel wire rope 45 between the upper and lower parts of the lifting mechanism 4 to lift the first segment stiffening beam 1.

[0073] After the first section stiffening beam 1 is lifted into place, the sling 3 is first fixed to the first section stiffening beam 1, and then the lifting mechanism 4 is fixed to the crane 5 through the extended section 55 of the crane 5, and finally the crane 5 moves forward to transport the lifting mechanism 4 to the location of the next set of slings 3.

[0074] After the first segment stiffening beam 1 is erected, in step 1, the stiffening beam 12 to be erected is transported to the position directly below the design position, and a barge can be used for transportation. In addition, the lifting mechanism 4 and the crane 5 are fixed, and the crane 5 is located on the beam surface of the erected stiffening beam 11.

[0075] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0076] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0077] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A mechanism for erecting a large-span suspension bridge stiffening beam on water, characterized in that: include: A traveling vehicle (5), comprising a vehicle body (51) and an extension section (55) connected to the vehicle body (51); A lifting mechanism (4), the lifting mechanism (4) is connected to the extending section (55), and comprises a clamping member (43) for connecting the sling (3), an upper crossbeam (41) connected to the clamping member (43), and a sling (42) for lifting the stiffening beam (12) to be erected is connected to the upper crossbeam (41) via a pulley block (44) and a steel wire rope (45).

2. The large-span suspension bridge stiffening girder overwater construction and erection mechanism according to claim 1, characterized in that: The trolley (5) comprises rollers (52) fixed to the bottom of the vehicle body (51).

3. The large-span suspension bridge stiffening beam water construction and erection mechanism according to claim 1, characterized in that: The traveling crane (5) is connected to a hoist (54) for lifting and lowering the lifting mechanism (4).

4. The large-span suspension bridge stiffening girder construction and erection mechanism on water as claimed in claim 3, characterized in that: The traveling crane (5) comprises a hydraulic rod connected to one end of the extending section (55) and used for extending or retracting the extending section (55).

5. The large-span suspension bridge stiffening girder construction and erection mechanism on water as claimed in claim 1, characterized in that: The clamping member (43) comprises a fixing plate and bolts arranged on the fixing plate.

6. The large-span suspension bridge stiffening girder construction and erection mechanism on water as claimed in claim 1, characterized in that: The upper cross beam (41) is rotatably connected to the extending section (55).

7. The large-span suspension bridge stiffening girder construction and erection mechanism on water as claimed in claim 1, characterized in that: The upper cross beam (41) and the hanger (42) are both steel box beams.

8. The large-span suspension bridge stiffening beam water construction and erection mechanism according to claim 1, characterized in that: A counterweight (53) is provided at the end of the vehicle body (51).

9. The large-span suspension bridge stiffening beam water construction and erection mechanism according to claim 1, characterized in that: The vehicle body (51) comprises a plurality of triangular truss structures which are connected and arranged.

10. A method for erecting a large-span suspension bridge stiffening beam on water, characterized in that: The method is implemented by using the large-span suspension bridge stiffening girder water construction and erection mechanism according to claims 1 to 9, and the method comprises the following steps: Erecting the first segment stiffening beam (1), and transporting the stiffening beam to be erected (12) to the position just below the designed position; The crane (5) is used to move along the erected stiffening beam (11), and the lifting mechanism (4) is sent to the designed position, and the extension section (55) is extended to fix the clamping member (43) of the lifting mechanism (4) and the sling (3) of the beam section to be erected; Starting the winch (54) to lower the steel wire rope (45), lowering the sling (42) of the lifting mechanism (4) to the beam surface of the stiffening beam (12) to be erected, and connecting and fixing the sling (42) to the stiffening beam (12) to be erected; Starting the winch (54) to retract the steel wire rope (45), driving the stiffening beam (12) to be erected to rise, and after the stiffening beam (12) to be erected is lifted to the target position, fixing the stiffening beam (12) to be erected and the sling (3); The clamping member (43) of the lifting mechanism (4) is released, the extended section (55) is retracted, and the next section of the stiffening beam is erected.

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