Hoisting device and method depending on bridge girder erection machine

Abstract

The invention discloses a hoisting device and method relying on a bridge girder erection machine, and relates to the technical field of fabricated bridge construction. The hoisting device relying on the bridge girder erection machine comprises a bridge girder erection machine main beam arranged on a bridge span structure, the bridge girder erection machine main beam is provided with a cantilever section suspended outside the bridge span structure, a hoisting assembly is arranged on the cantilever section, and a lifting type supporting assembly is arranged at the end, away from the bridge span structure, of the cantilever section and used for being supported on a site foundation. The hoisting assembly is arranged on the overhanging section of the main beam of the bridge girder erection machine, and the lifting type supporting assembly is arranged, so that the problem that the requirement of a traditional hoisting method for a construction site is high can be effectively solved. The supporting height of the lifting type supporting assembly can be flexibly adjusted according to different topographic conditions, the stability and balance of the main beam of the bridge girder erection machine are ensured, the strict limitation of a traditional hoisting method on the flatness and hardness of the ground is broken through, and additional building of shortcuts or large-area foundation treatment is not needed.

Description

Technical Field

[0001] This application relates to the technical field of prefabricated bridge construction, and particularly relates to a hoisting device and method relying on a bridge erecting machine. Background Art

[0002] A prefabricated bridge is a bridge structure form in which some or all components of the bridge are prefabricated and then assembled on site. The construction sequence of a prefabricated bridge is usually to construct the bridge foundation first, then the bridge piers, and finally the bearing system and the superstructure.

[0003] During the construction process of a prefabricated bridge, whether it is the construction of the substructure or the superstructure, a temporary access road needs to be built first to facilitate the entry of machinery and materials and meet the requirements of construction personnel, materials, and machinery. Then, the prefabricated bridge is constructed by hoisting. Currently, common hoisting methods include the self-propelled crane hoisting method, the cross-bridge pier gantry crane hoisting method, and the double-guide beam bridge erecting machine beam erection method.

[0004] The self-propelled crane hoisting method uses a movable crane to lift and place components such as beam slabs to the installation position. However, before installing the movable crane, a flat and solid site needs to be selected to ensure the safety and stability of the equipment. Therefore, it is only applicable to flat and waterless ground conditions.

[0005] The cross-bridge pier gantry crane hoisting method sets up a gantry crane between the bridge piers and conducts the hoisting and erection of beam slabs by moving along the guide rails. This method has extremely high requirements for the site foundation and is only applicable to flat, open, hard, and solid ground environments.

[0006] The double-guide beam bridge erecting machine beam erection method completes the aerial hoisting and walking process through the guide beam system, walking system, and support system of the bridge erecting machine. Although this method is not restricted by the underground environment, the hoisting range is highly targeted and is only applicable to the hoisting of the bridge superstructure. Moreover, it must be carried out after the construction of the pier columns of the next span is completed. For the construction of pier columns, a temporary access road still needs to be built first, and then the self-propelled crane or cross-bridge pier gantry crane is used for hoisting, which has extremely high requirements for the site foundation, resulting in high construction costs and low hoisting efficiency. Summary of the Invention

[0007] The purpose of this application is to provide a hoisting device and method relying on a bridge erecting machine to solve the problem that the hoisting method is restricted by the surface environment.

[0008] The technical solution adopted by this application to solve its technical problems is:

[0009] In a first aspect, a hoisting device relying on a bridge erecting machine is provided, which includes a main beam of the bridge erecting machine arranged on the bridge span structure. The main beam of the bridge erecting machine has a cantilever section suspended outside the bridge span structure. A lifting assembly is provided on the cantilever section, and a lifting support assembly is provided at one end of the cantilever section away from the bridge span structure. The lifting support assembly is used to support on the site foundation.

[0010] Further, there are two lifting support assemblies, and the two lifting support assemblies are respectively arranged on both sides of the cantilever section.

[0011] Further, the lifting support assembly includes a support part and a lifting part connected in sequence from top to bottom. The support part is connected to the cantilever section, and the lifting part is used to support on the site foundation.

[0012] Further, the lifting part includes a jack and a support plate. One end of the jack is connected to the support part, and the other end of the jack is connected to the support plate.

[0013] Further, the lifting support assembly is hinged to the main beam of the bridge erecting machine, and a driving mechanism is provided between the two. The driving mechanism is used to drive the lifting support assembly to rotate in the vertical plane.

[0014] Further, the driving mechanism includes a winding and unwinding member and a towing rope. The winding and unwinding member is arranged on the main beam of the bridge erecting machine. One end of the towing rope is connected to the winding and unwinding member, and the other end of the towing rope is connected to the lifting support assembly. The winding and unwinding member winds or unwinds the towing rope to make the lifting support assembly rotate in the vertical plane.

[0015] Further, the winding and unwinding member includes a motor and a winding drum connected to the output shaft of the motor. The motor is arranged on the main beam of the bridge erecting machine. One end of the towing rope is connected to the winding drum, and the towing rope is wound around the winding drum.

[0016] Further, the lifting assembly includes a movable frame and a crane. The movable frame is arranged on the cantilever section and can move along the axial direction of the cantilever section. The crane is arranged on the movable frame and can move in a horizontal direction perpendicular to the axial direction of the cantilever section.

[0017] Further, the movable frame includes a cross beam and a cross beam driving member. The cross beam is arranged on the cantilever section, and the cross beam driving member is arranged between the cross beam and the cantilever section and is used to drive the cross beam to move along the axial direction of the cantilever section.

[0018] In a second aspect, a hoisting method relying on a bridge erecting machine is provided, which uses the hoisting device provided in the first aspect. The method includes:

[0019] Control the movement of the main beam of the bridge erecting machine on the bridge span structure, move the cantilever section above the construction position, and control the lifting support assembly to support on the site foundation;

[0020] Control the hoisting assembly to move on the cantilever section to a position close to the lifting support assembly, and use the hoisting assembly to lift the lifted object in stages to preload the lifting support assembly. During the preloading process, control the lifting support assembly to extend to make up for the settlement of the site foundation;

[0021] After the preloading is completed, use the hoisting assembly to officially lift the lifted object.

[0022] Advantages of the present application:

[0023] The hoisting device and method relying on the bridge erecting machine provided by the embodiment of the present application can effectively solve the problem that the traditional hoisting method has high requirements for the construction site by arranging a hoisting assembly on the cantilever section of the main beam of the bridge erecting machine and equipping a lifting support assembly. The lifting support assembly can flexibly adjust the support height according to different terrain conditions to ensure the stability and balance of the main beam of the bridge erecting machine, so as to adapt to various construction environments including complex terrains such as deep ditches, river valleys, and soft soil foundations, break through the strict limitations of the traditional hoisting method on the ground flatness and hardness, and eliminate the need for additional construction of access roads or large-area foundation treatment, greatly reducing the preliminary preparation work, shortening the construction period, and reducing the construction cost.

[0024] The hoisting device and method relying on the bridge erecting machine provided by the embodiment of the present application make full use of the structural advantages of the bridge erecting machine by arranging the hoisting assembly on the cantilever section of the main beam of the bridge erecting machine, realizing the aerial relay and continuous operation of the hoisting operation. Compared with the traditional self-propelled crane or cross-bridge gantry crane hoisting method, this device does not need to frequently move the equipment or re-arrange the guide rails, reducing the equipment dispatch and installation time, and significantly improving the hoisting efficiency. At the same time, the use of the lifting support assembly provides reliable support for the main beam of the bridge erecting machine, enhancing the stability during the hoisting process and reducing the safety risks caused by uneven ground settlement or equipment overturning. In addition, this hoisting device can also be carried out synchronously with the construction of the pier column of the next span, avoiding the construction period delay caused by waiting for the completion of the pier column construction in the traditional method, further optimizing the construction process, and improving the overall construction efficiency. Description of the drawings

[0025] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, so they should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0026] Figure 1 is the front view of the hoisting device provided by the embodiment of the present application;

[0027] Figure 2 is the side view of the hoisting device provided by the embodiment of the present application.

[0028] Figure 3 is the enlarged view of the connection between the lifting component and the main girder of the bridge erecting machine.

[0029] Reference numerals:

[0030] 1 - bridge pier;

[0031] 2 - bridge span structure;

[0032] 3 - main girder of the bridge erecting machine;

[0033] 31 - cantilever section;

[0034] 32 - support section;

[0035] 4 - lifting component;

[0036] 41 - movable frame;

[0037] 411 - cross beam; 412 - cross beam driving member;

[0038] 42 - crane;

[0039] 5 - lifting support component;

[0040] 51 - support part;

[0041] 52 - lifting part;

[0042] 521 - jack; 522 - support plate;

[0043] 6 - driving mechanism;

[0044] 61 - retracting and releasing member;

[0045] 62 - towing rope;

[0046] 7 - rotating shaft. Detailed implementation manners

[0047] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present application. Without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other.

[0048] In the description of the present application, the orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present application. Without special instructions, in the case of satisfying the relative positional relationship shown in the drawings, the above-mentioned directional descriptions can be flexibly set during the actual application process.

[0049] In the description of the present application, it should be noted that unless otherwise clearly specified and limited, the terms "set", "installed", "connected", "coupled" 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 directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0050] See Figure 1 、 Figure 2 、 Figure 3 As shown in

[0051] See Figure 1 , the bridge span structure 2 is the upper structure of the bridge that bears the transportation load of automobiles or other vehicles. The two ends of the bridge span structure 2 are respectively fixed on the tops of two adjacent bridge piers 1. The bridge erecting machine is a device that places the prefabricated bridge span structure onto the prefabricated bridge piers. For example, the bridge erecting machine is set on the already installed bridge span structure 2 and can travel on the bridge span structure 2. During construction, the bridge erecting machine is controlled to travel to a predetermined position, the bridge span structure 2 to be installed is lifted by the bridge erecting machine, and then transported to the designated position and placed on the prefabricated bridge pier 1.

[0052] See Figure 1 、 Figure 2 、 Figure 3, the main girder 3 of the bridge erecting machine is the core load-bearing component of the bridge erecting machine, which includes two parallel box-shaped longitudinal girders fixedly connected by cross beams. The main girder 3 of the bridge erecting machine includes two sections along its length direction, namely the cantilever section 31 and the support section 32. The support section 32 is supported directly above the already installed bridge span structure 2, and the cantilever section 31 is suspended outside the already installed bridge span structure 2. The lifting component 4 is installed on the cantilever section 31 and is used to lift the construction materials on site. The lifting support component 5 is a support structure with adjustable height. The upper end of the lifting support component 5 is connected to the end of the cantilever section 31 away from the support section 32, and the lower end of the lifting support component 5 is used to support on the site foundation. Thus, the cantilever section 31 of the main girder 3 of the bridge erecting machine can be supported by the lifting support component 5.

[0053] The hoisting device relying on the bridge erecting machine provided by the embodiment of the present application can effectively solve the problem of high requirements for the construction site of the traditional hoisting method by arranging the lifting component 4 on the cantilever section 31 of the main girder 3 of the bridge erecting machine and equipping with the lifting support component 5. The lifting support component 5 can flexibly adjust the support height according to different terrain conditions to ensure the stability and balance of the main girder 3 of the bridge erecting machine, so as to adapt to various construction environments including complex terrains such as deep ditches, river valleys, and soft soil foundations, breaking through the strict limitations of the traditional hoisting method on the ground flatness and hardness, without the need for additional construction of access roads or large-area foundation treatment, greatly reducing the preliminary preparation work, shortening the construction period, and reducing the construction cost.

[0054] The hoisting device relying on the bridge erecting machine provided by the embodiment of the present application, by arranging the lifting component 4 on the cantilever section 31 of the main girder 3 of the bridge erecting machine, makes full use of the structural advantages of the bridge erecting machine and realizes the aerial relay and continuous operation of the hoisting operation. Compared with the traditional self-propelled crane or cross-bridge gantry crane hoisting method, this device does not need to frequently move the equipment or re-arrange the guide rails, reducing the equipment dispatching and installation time and significantly improving the hoisting efficiency. At the same time, the use of the lifting support component 5 provides reliable support for the main girder 3 of the bridge erecting machine, enhancing the stability during the hoisting process and reducing the safety risks brought by uneven ground settlement or equipment overturning. In addition, this hoisting device can also be carried out synchronously with the construction of the pier columns of the next span, avoiding the construction period delay caused by waiting for the completion of the pier column construction in the traditional method, further optimizing the construction process and improving the overall construction efficiency.

[0055] The lifting support component 5 can include one, which is arranged at the middle position of the end of the cantilever section 31. In some embodiments, see Figure 2 , the lifting support component 5 includes two, and the two lifting support components 5 are respectively arranged on both sides of the cantilever section 31.

[0056] Correspondingly, by respectively arranging the lifting support assemblies 5 on both sides of the cantilever section 31, more balanced supporting forces can be provided for the main beam 3 of the bridge erecting machine, effectively avoiding structural skew or instability caused by a single support. Especially when hoisting heavy components, the anti-overturning ability and overall stability of the main beam 3 of the bridge erecting machine can be significantly improved. Arranging two lifting support assemblies 5 can better adapt to complex construction environments. For example, in the case of uneven ground or local soft foundations, the two lifting support assemblies 5 can respectively adjust the support height to keep the cantilever section 31 of the main beam 3 of the bridge erecting machine in a stable posture all the time, thereby providing a stable platform for the hoisting operation and reducing construction risks brought by structural shaking or inclination. This structure not only reduces the requirements for the site flatness, but also allows the bridge erecting machine to operate safely under a wider range of terrain conditions, such as crossing gullies, rivers or constructing on soft soil foundations.

[0057] In some embodiments, referring to Figure 2 , the lifting support assembly 5 includes a support part 51 and a lifting part 52 connected in sequence from top to bottom. The support part 51 is connected to the cantilever section 31, and the lifting part 52 is used to support on the site foundation.

[0058] Correspondingly, by dividing the lifting support assembly 5 into the support part 51 and the lifting part 52, the functional zoning of the structure is realized. The support part 51 is connected to the cantilever section 31 of the main beam 3 of the bridge erecting machine to ensure a firm connection between the two. The lifting part 52 is directly in contact with the site foundation and is responsible for adjusting the height to adapt to different terrains. This zoning design makes the functions of each component more clear, facilitating independent maintenance and adjustment during the construction process. For example, when it is necessary to replace worn components, the support part 51 or the lifting part 52 can be replaced separately without replacing the entire lifting support assembly 5, thereby reducing the maintenance cost.

[0059] The support part 51 can be customized according to the size and shape of the main beam 3 of the bridge erecting machine. For example, the support part 51 can be a box-shaped structure, and its cross-sectional size and shape can be consistent with the cross-sectional size and shape of the main beam 3 of the bridge erecting machine. The lifting part 52 can select different support forms according to the site conditions, such as hydraulic lifting, mechanical lifting, etc.

[0060] In some embodiments, referring to Figure 2 , the lifting part 52 includes a jack 521 and a support plate 522. One end of the jack 521 is connected to the support part 51, and the other end of the jack 521 is connected to the support plate 522. Exemplarily, the upper end of the jack 521 can be connected to the lower end of the support part 51 through a detachable structure such as a bolt, and the lower end of the jack 521 can also be connected to the support plate 522 through a detachable structure such as a bolt.

[0061] Correspondingly, the jack 521 has a high load-bearing capacity and can withstand a large vertical load. The support plate 522 evenly distributes the load transmitted by the jack 521 to the site foundation by increasing the contact area with the site foundation, thus effectively avoiding ground settlement or damage caused by local stress concentration. This structure not only improves the load-bearing capacity of the lifting part 52 but also enhances the stability of the entire hoisting device. The combined structure of the jack 521 and the support plate 522 is relatively simple, with fewer components, which is convenient for maintenance and repair, reduces the risk of failure caused by complex structures, and improves the reliability and service life of the device. At the same time, it can be expanded or upgraded according to different construction requirements to adapt to more types of construction environments; for example, if a higher load-bearing capacity is required, the jack 521 with a larger tonnage can be replaced; if it is necessary to adapt to more complex terrains, the area of the support plate 522 can be increased or special foundation treatment methods can be adopted.

[0062] The upper end of the lifting support assembly 5 can be fixedly connected to the cantilever section 31 of the main beam 3 of the bridge girder erecting machine. In some embodiments, refer to Figure 1 , Figure 2 , Figure 3 , the lifting support assembly 5 is hinged to the main beam 3 of the bridge girder erecting machine, and a driving mechanism 6 is provided therebetween. The driving mechanism 6 is used to drive the lifting support assembly 5 to rotate in the vertical plane.

[0063] Exemplarily, refer to Figure 2 , the upper end of the lifting support assembly 5 is connected to the box-shaped longitudinal beam of the main beam 3 of the bridge girder erecting machine through a horizontally arranged rotating shaft 7, so that the lifting support assembly 5 can rotate around the rotating shaft 7 in the vertical plane. Among them, the axis of the rotating shaft 7 is perpendicular to the length direction of the box-shaped longitudinal beam. Each lifting support assembly 5 can be connected to the main beam 3 of the bridge girder erecting machine through a driving mechanism 6.

[0064] Correspondingly, by hinging the lifting support assembly 5 to the main beam 3 of the bridge girder erecting machine, the angle adjustment of the lifting support assembly 5 can be realized, so that the lifting support assembly 5 can adjust its contact angle with the site foundation according to different terrain conditions to ensure that it always maintains the best contact state with the site foundation. After the construction is completed, the driving mechanism 6 can also be used to drive the lifting support assembly 5 to turn upward and fold. This folding function can effectively avoid the collision of the lifting support assembly 5 with other structures during the movement of the bridge girder erecting machine, thus ensuring the safe movement and transfer of the bridge girder erecting machine, while reducing the space occupation and improving the flexibility and applicability of the equipment.

[0065] The driving mechanism 6 can select different structures, such as hydraulic drive, electric drive or mechanical drive, etc. In some embodiments, refer to Figure 1, the driving mechanism 6 includes a winding and unwinding member 61 and a towing rope 62. The winding and unwinding member 61 is arranged on the main girder 3 of the bridge erecting machine. One end of the towing rope 62 is connected to the winding and unwinding member 61, and the other end of the towing rope 62 is connected to the lifting support assembly 5. The winding and unwinding member 61 winds up or releases the towing rope 62 so that the lifting support assembly 5 rotates in the vertical plane.

[0066] During operation, control the winding and unwinding member 61 to wind up the towing rope 62. The towing rope 62 drives the lifting support assembly 5 to flip upwards and fold; control the winding and unwinding member 61 to release the towing rope 62, and the lifting support assembly 5 flips downwards and unfolds under the action of gravity. Correspondingly, by winding up or releasing the towing rope 62 through the winding and unwinding member 61, the stable rotation of the lifting support assembly 5 in the vertical plane can be realized. This operation method is not only flexible, but also avoids complex mechanical transmission devices, reduces the maintenance cost and failure rate, and improves the overall reliability.

[0067] Exemplarily, the winding and unwinding member 61 includes a motor and a winding drum connected to the output shaft of the motor. The motor is arranged on the main girder 3 of the bridge erecting machine. One end of the towing rope 62 is connected to the winding drum, and the towing rope 62 is wound around the winding drum.

[0068] Correspondingly, by controlling the forward and reverse rotation of the motor to drive the forward and reverse rotation of the winding drum, the winding and unwinding of the towing rope 62 can be realized. The winding drum driven by the motor can provide stable and strong power to ensure the smooth and reliable winding and unwinding process of the towing rope 62. The combined structure of the motor and the winding drum is compact and can be directly installed on the main girder 3 of the bridge erecting machine without occupying extra space, making the integration degree of the driving mechanism 6 and the main girder 3 of the bridge erecting machine higher and the overall layout more reasonable. During the construction process, the compact structure reduces the interference to the construction site and is also convenient for the maintenance and overhaul of the equipment.

[0069] In some embodiments, refer to Figure 2 、 Figure 3 , the lifting assembly 4 includes a movable frame 41 and a crane 42. The movable frame 41 is arranged on the cantilever section 31 and can move along the axial direction of the cantilever section 31. The crane 42 is arranged on the movable frame 41 and can move along the horizontal direction perpendicular to the axial direction of the cantilever section 31.

[0070] Correspondingly, the coordinated movement of the movable frame 41 and the crane 42 enables the lifting assembly 4 to move in two directions, that is, the movable frame 41 moves along the axial direction of the cantilever section 31, and the crane 42 moves along the horizontal direction perpendicular to the axial direction of the cantilever section 31. This multi-dimensional movement function expands the coverage range of the hoisting operation and improves the hoisting efficiency.

[0071] Exemplarily, the movable frame 41 includes a cross beam 411 and a cross beam driving member 412. The cross beam 411 is disposed on the cantilever section 31, and the cross beam driving member 412 is disposed between the cross beam 411 and the cantilever section 31 and is used to drive the cross beam 411 to move axially along the cantilever section 31. For example, slide rails are respectively fixed to the tops of the two box-shaped longitudinal beams of the main beam 3 of the bridge erecting machine. The two ends of the cross beam 411 are respectively in sliding fit with the two slide rails. The cross beam driving member 412 is used to drive the cross beam 411 to move on the slide rails, so as to realize the precise positioning of the crane 42 along the axial direction of the main beam 3 of the bridge erecting machine. Wherein, the cross beam driving member 412 may include a motor disposed on the cross beam 411, a gear mounted on the output shaft of the motor, and a rack fixed to the top of the box-shaped longitudinal beam. The gear is in meshing transmission with the rack.

[0072] The embodiment of the present application provides a hoisting method relying on a bridge erecting machine, adopting the above hoisting device; the method includes:

[0073] Control the main beam 3 of the bridge erecting machine to move on the bridge span structure 2, so that the cantilever section 31 moves above the construction position, and control the lifting support assembly 5 to support on the site foundation;

[0074] Control the hoisting assembly 4 to move on the cantilever section 31 to a position close to the lifting support assembly 5, and use the hoisting assembly 4 to hoist the hoisted object in stages to preload the lifting support assembly 5. During the preloading process, control the lifting support assembly 5 to extend to make up for the settlement of the site foundation;

[0075] After the preloading is completed, use the hoisting assembly 4 to formally hoist the hoisted object.

[0076] For the hoisting method relying on the bridge erecting machine provided by the embodiment of the present application, since the hoisting device provided by the above embodiment is adopted, it has the advantages of the hoisting device and will not be elaborated here. By preloading the lifting support assembly 5 before formal hoisting, the bearing capacity and stability of the site foundation can be evaluated in advance. During the preloading process, the lifting support assembly 5 can be adjusted to extend in real time according to the foundation settlement situation, effectively making up for the change in the support height caused by uneven foundation settlement. This preloading measure not only optimizes the foundation bearing capacity, significantly reduces the risk of hoisting accidents caused by unstable foundation or uneven settlement, but also provides stable support conditions for formal hoisting, ensuring the smoothness and safety of the hoisting process, and is especially suitable for construction scenarios with complex geological conditions or soft soil foundations.

[0077] The above is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A hoisting device relying on a bridge erecting machine, characterized in that: The invention comprises a main beam (3) of a bridge erecting machine arranged on a bridge span structure (2), the main beam (3) of the bridge erecting machine having a cantilever section (31) suspended outside the bridge span structure (2), a lifting assembly (4) being arranged on the cantilever section (31), and a lifting support assembly (5) being arranged at one end of the cantilever section (31) away from the bridge span structure (2), the lifting support assembly (5) being used for supporting on a site foundation.

2. The hoisting device based on the bridge erecting machine according to claim 1 is characterized in that: The lifting support components (5) include two lifting support components (5), and the two lifting support components (5) are respectively arranged on both sides of the cantilever section (31).

3. The hoisting device based on the bridge erecting machine according to claim 1 or 2, characterized in that: The lifting support assembly (5) comprises a support portion (51) and a lifting portion (52) which are connected in sequence from top to bottom, the support portion (51) is connected to the cantilever section (31), and the lifting portion (52) is used to be supported on a site foundation.

4. The hoisting device based on the bridge erecting machine according to claim 3 is characterized in that: The lifting part (52) comprises a jack (521) and a support plate (522); one end of the jack (521) is connected to the support part (51), and the other end of the jack (521) is connected to the support plate (522).

5. The hoisting device relying on the bridge erecting machine according to claim 1 or 2, characterized in that: The lifting support assembly (5) is hinged to the main beam (3) of the bridge erecting machine, and a driving mechanism (6) is provided between the two. The driving mechanism (6) is used to drive the lifting support assembly (5) to rotate in a vertical plane.

6. The hoisting device relying on the bridge erecting machine according to claim 5 is characterized in that: The driving mechanism (6) comprises a retractable component (61) and a traction rope (62); the retractable component (61) is arranged on the main beam (3) of the bridge erecting machine; one end of the traction rope (62) is connected to the retractable component (61); the other end of the traction rope (62) is connected to the lifting support assembly (5); the retractable component (61) retracts or releases the traction rope (62) to enable the lifting support assembly (5) to rotate in a vertical plane.

7. The hoisting device for a bridge erecting machine according to claim 6 is characterized in that: The retractable component (61) comprises a motor and a winding drum connected to the output shaft of the motor, the motor is arranged on the main beam (3) of the bridge erection machine, one end of the traction rope (62) is connected to the winding drum, and the traction rope (62) is wound on the winding drum.

8. The hoisting device relying on the bridge erecting machine according to claim 1 is characterized in that: The lifting assembly (4) comprises a movable frame (41) and a crane (42); the movable frame (41) is arranged on the cantilever section (31) and can move along the axial direction of the cantilever section (31); the crane (42) is arranged on the movable frame (41) and can move along a horizontal direction perpendicular to the axial direction of the cantilever section (31).

9. The hoisting device relying on the bridge erecting machine according to claim 8 is characterized in that: The movable frame (41) comprises a crossbeam (411) and a crossbeam driving member (412); the crossbeam (411) is arranged on the cantilever section (31); the crossbeam driving member (412) is arranged between the crossbeam (411) and the cantilever section (31) and is used to drive the crossbeam (411) to move axially along the cantilever section (31).

10. A method for hoisting a bridge erecting machine, characterized in that: Using the lifting device described in any one of claims 1 to 9; the method comprises: Controlling the main beam (3) of the bridge erection machine to move on the bridge span structure (2), so that the cantilever section (31) moves to above the construction position, and controlling the lifting support assembly (5) to support on the site foundation; Controlling the lifting assembly (4) to move on the cantilever section (31) to a position close to the lifting support assembly (5), using the lifting assembly (4) to lift the load in stages to pre-press the lifting support assembly (5), and controlling the lifting support assembly (5) to extend during the pre-pressing process to compensate for the settlement of the site foundation; After the pre-pressing is completed, the lifting assembly (4) is used to formally lift the load.

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