A hoisting device and hoisting method for main beam of cable-stayed bridge

Abstract

The present invention relates to the technical field of cable-stayed bridge construction, and in particular to a cable-stayed bridge main beam hoisting device and hoisting method, wherein the cable-stayed bridge main beam hoisting device comprises a lifting frame, a sliding device and a tower crane, wherein the lifting frame is arranged on the upper crossbeam of a diamond-shaped bridge tower, the lifting frame is used to lift the pier top section main beam, the sliding device is arranged on the lower crossbeam of the bridge tower, the sliding device is used to move the pier top section main beam along the width direction of the bridge tower, the tower crane is arranged on one side along the width direction of the bridge tower, and the tower crane is used to lift the suspended section main beam. The use of the device solves the problem that during the existing construction process of the pier top section bridge deck construction, the suspension of the bridge tower construction will affect the overall construction period, causing construction period delays and labor losses, and the process is cumbersome and the construction material occupancy rate is large.

Description

Technical Field

[0001] The invention relates to the technical field of cable-stayed bridge construction, in particular to a hoisting device and a hoisting method for a main beam of a cable-stayed bridge. Background Art

[0002] The bridge tower is the main load-bearing component of the entire cable-stayed bridge structure, and is responsible for transmitting various loads acting on the main beam and itself to the foundation. Among them, the diamond-shaped bridge tower is widely used in terrains where bridge piers cannot be erected across rivers or traffic routes due to its beautiful shape, strong sense of stability, large lateral stiffness, and good force-bearing performance. The lower part of the tower column is tilted inward, which greatly reduces the size of the abutment and foundation. The steel structure of the bridge is generally processed and manufactured in a processing plant. After completion, it is transported to the bridge construction site and installed and constructed using large-scale lifting equipment. The lifting equipment generally uses bridge deck cranes, cable cranes, and cantilever mobile lifting equipment. During the installation of the steel beams of the entire bridge, the installation of the pier top section steel beam is particularly important. Its linear control directly affects the subsequent suspended segments. For the pier top section steel beam with heavy segment weight and many lifting rods, choosing the best installation method can effectively speed up its construction progress, save construction costs, and ensure its construction safety. The existing construction method requires the installation of a pier side bracket first, and then the installation of a station bracket on the pier side bracket. After the installation of the station bracket is completed, it is necessary to pre-press and reversely pull, and then install the bridge crane on the station bracket through a tower crane, and install the pier top section steel beam on its basis. Because the diamond-shaped tower column is an inward-inclined structure, the bridge crane cannot install it in place by normally rotating the lifting boom when hoisting the main beam, and it is necessary to add a sliding device. When the tower crane hoists the pier top section, the cantilever length and height conflict with the position of the upper crossbeam. Therefore, in the traditional construction process, the bridge deck main beam of the pier top section is hoisted first, and then the upper crossbeam part is constructed after the hoisting is completed. This construction method requires the use of a tower crane to complete the installation of the pier top section main beam before the construction of the upper crossbeam of the bridge tower, and then install the bridge crane on this basis. Suspending the construction of the upper crossbeam of the bridge tower will affect the overall construction period, causing delays in the construction period and loss of labor. The process is cumbersome and the construction material occupancy rate is large. Summary of the invention

[0003] The purpose of the present invention is to solve the problem in the prior art that the construction of the bridge tower will be suspended during the hoisting construction of the main beam of the top section of the bridge tower pier, delaying the construction period of the entire cable-stayed bridge, and provide a hoisting device and a hoisting method for the main beam of a cable-stayed bridge.

[0004] In order to achieve the above object, the technical solution adopted by the present invention is:

[0005] A lifting device for a main beam of a cable-stayed bridge comprises a lifting frame, a sliding device and a tower crane, wherein the lifting frame is arranged on an upper crossbeam of a diamond-shaped bridge tower, the lifting frame is used to lift the main beam of a pier top section, the sliding device is arranged on a lower crossbeam of the bridge tower, the sliding device is used to move the main beam of the pier top section along the width direction of the bridge tower, the tower crane is arranged on one side along the width direction of the bridge tower, and the tower crane is used to lift the main beam of a cantilever section.

[0006] After the construction of the upper crossbeam of the bridge tower is completed, the lifting frame is connected to lift the main beam of the pier top section of the bridge tower from the ground. The sliding device that can move along the width direction of the bridge tower is arranged on the lower crossbeam. The lifting frame can lift the main beam of the pier top section and place it on the sliding device, which is moved to a designated position by the sliding device. The tower crane is installed on the outside along the width direction of the bridge tower, and the tower crane is used to lift the main beam of the cantilever section and connect it with the main beam of the pier top section. The tower crane can also complete the lifting of the remaining main beam of the cantilever section. The lifting frame is removed after the bridge deck construction is completed. In this process, the lifting frame is used to lift the pier top section instead of using the tower crane to lift the main beam of the pier top section in the prior art. The bridge tower can complete the construction normally, avoiding the problem of suspending the construction of the upper crossbeam of the bridge tower and continuing the construction of the bridge tower only after the lifting is completed, thereby shortening the construction period extended by suspending the construction of the bridge tower.

[0007] As a preferred embodiment of the present invention, the lifting frame includes a truss, a winch and a pulley, the truss is fixed to the upper crossbeam, the truss is used to suspend the pulley, and the winch can retract and release the traction rope used for lifting through the pulley.

[0008] In order to ensure the stability of the lifting frame, a truss structure is selected. The lifting frame is fixedly connected to the upper crossbeam through the truss. The winch can retract and release the traction rope used for lifting through the pulley, which can facilitate lifting and reduce electricity consumption.

[0009] As a preferred embodiment of the present invention, the truss comprises an upper cross bar, a lower cross bar and a diagonal brace, one end of the upper cross bar and one end of the lower cross bar are respectively fixed to the top surface and the bottom surface of the upper cross beam, and the diagonal brace connects the free ends of the upper cross beam and the lower cross beam.

[0010] In order to ensure the stability of the entire structure, one end of the upper cross bar and the lower cross bar are fixed to the top and bottom of the upper cross beam respectively, and common connection methods such as bolting, pinning, and welding are adopted. The free ends of the upper cross bar and the lower cross bar are connected through the diagonal brace, and the connection method adopts the anchoring, bolting, welding, etc. commonly used in the prior art.

[0011] As a preferred embodiment of the present invention, the pulley comprises a multi-door pulley, and the truss and the pulley are connected via the shoulder beam.

[0012] The pulley comprises a pulley group composed of multiple pulleys. According to actual measurement requirements, commonly used five-door pulley groups, six-door pulley groups, etc. can be used to facilitate lifting and reduce the power used by the winch, thereby reducing electricity consumption.

[0013] As a preferred embodiment of the present invention, the sliding device includes a pier-side bracket, an electric running wheel, a sliding rail and a sliding plate. The pier-side bracket is symmetrically arranged on both sides of the lower crossbeam and the pier-side bracket is arranged along the thickness direction of the bridge tower. The sliding rail is connected to the pier-side bracket. The sliding plate is slidably connected to the sliding rail through the electric running wheel, and the bottom surface of the sliding plate is higher than the top surface of the lower crossbeam.

[0014] The pier-side bracket is used to provide installation space and stable support for the slide rail and the slide plate. The slide plate is connected to the electric walking wheel and adopts commonly used fixing methods such as welding, bolting, and anchoring. The bottom of the slide plate is set at a height higher than the top surface of the lower cross beam to ensure that the main beam can be stably placed on the sliding device and move.

[0015] The present invention also provides a cable-stayed bridge main beam hoisting method, which uses a cable-stayed bridge main beam hoisting device and comprises the following steps:

[0016] S1. Install lifting frame and tower crane;

[0017] S2. Use the lifting frame to lift all the main beams of the pier top section until they are higher than the lower beam, and install the sliding device;

[0018] S3. Use the lifting frame to lift all the main beams of the pier top section and place them on the sliding device;

[0019] S4. Use the sliding device to move one of the pier top section main beams along the width direction of the bridge tower until it is located on the side of the bridge tower close to the tower crane; use the tower crane to respectively hoist the two sections of the cantilever section main beams and connect them to the two ends of the corresponding pier top section main beams;

[0020] S5. Use the lifting frame to lift the pier top section main beam to be spliced, and use the sliding device to move the current connection of the pier top section main beam as a whole until it is located on the side of the bridge tower away from the tower crane;

[0021] S6. Use a lifting frame to lower the main beam of the pier top section to be spliced ​​and place it on the sliding device;

[0022] S7. Repeat steps S4 to S6, so that both ends of the remaining pier top section main beams are connected to the corresponding cantilever section main beams.

[0023] The hoisting device used in this solution can complete the hoisting and connection of the pier top section main beam and the adjacent cantilever section main beam after the construction of the upper crossbeam is completed, which solves the previous construction steps and methods of the upper crossbeam of the bridge tower, which requires the pier top section main beam to be hoisted and connected before construction, reduces the time of suspending the main tower construction, and shortens the construction period.

[0024] As a preferred solution of the present invention, the method for hoisting the remaining main beams of the bridge deck further comprises the following steps:

[0025] S8. After step S7, connect a vertical jack to the lower beam, lift all the main beams of the pier top section, and remove the sliding device; use the vertical jack to lift all the main beams of the pier top section, install the steel beam for temporary consolidation, and hang the inclined cable;

[0026] S9. construct the bridge deck and wet joints on the cantilever section main beam and the pier top section main beam, install the steel beam transfer platform on the pier top section main beam close to the tower crane, and use the tower crane to lift the beam transport trolley and the bridge crane until they are placed on the pier top section bridge deck;

[0027] S10. Use the tower crane to place the cantilevered main beam to be spliced ​​on the beam transport trolley after the steel beam conversion platform changes direction;

[0028] S11. Move the beam transport trolley to the preset position, use the bridge crane to hoist the cantilevered main beam to be spliced ​​to the cantilever end of the spliced ​​cantilevered main beam, bolt the two connection ports in place, install the steel beam for temporary consolidation, hang the inclined cable, and construct the corresponding bridge deck and wet joint;

[0029] S12. Repeat steps S10 to S11 until the construction of the cable-stayed bridge deck is completed.

[0030] By using this hoisting method, after the pier top section is hoisted, the lifting frame can lift the main beam standard section converted by the steel beam conversion platform and place it on the beam transport trolley, replacing the role of the bridge crane of the pier top section in the traditional construction process, reducing the occupation of engineering machinery and reducing the rental fee of machinery. The temporary fixing of the steel beam is set on the top of the lower cross beam, which can temporarily fix the main beam of the pier top section with the lower cross beam.

[0031] As a preferred embodiment of the present invention, step S1 also includes erecting a temporary support frame on the top of the lower cross beam, wherein the temporary support frame is used to temporarily store the main beam, and the bottom surface of the temporary support frame is higher than the top surface of the sliding device; in step S2, the lifting frame is used to lift all the pier top section main beams until they are higher than the lower cross beam, and then is replaced by using the lifting frame to lift all the pier top section main beams until they are placed on the temporary support frame; after step S3, the temporary support frame is removed.

[0032] The temporary support frame is at the top of the lower cross beam, and cooperates with the lifting frame to lift the main beam standard brick section located in the middle and temporarily store it. The bottom of the temporary support frame is set at a height higher than the top surface of the sliding device.

[0033] As a preferred solution of the present invention, the steel beam conversion platform is arranged on the side of the pier top section main beam close to the tower crane.

[0034] As a preferred solution of the present invention, the vertical jacks are evenly arranged on the lower cross beam and symmetrically arranged on the inner side of the slide rail.

[0035] The minimum usage unit of the vertical jack is a pair. When using the vertical jack to return the main longitudinal beams of the two pier top sections, it is calculated that the jack's lifting height is insufficient and it should be lowered in multiple times. During the falling process, temporary supports are used to convert the system to facilitate the return of the vertical jack.

[0036] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0037] 1. A lifting device for the main beam of a cable-stayed bridge deck. The construction method of the main beam of the pier top section is convenient, the operators are easy to master, the workload of worker training is small, and the main beam of the pier top section is limited by the lifting performance of the tower crane. The existing tower crane cannot meet the lifting operation radius and lifting performance requirements of the main beam of the pier top section.

[0038] 2. A method for hoisting the deck of a cable-stayed bridge can be applicable to the installation of various diamond-shaped tower pier top section main beams; the lifting frame device used in this method has high construction efficiency. The original construction method uses a tower crane to hoist the pier top section main beam, but it is necessary to suspend the tower construction on site. Before the construction of the tower upper beam, the pier top section main beam, bridge panel and bridge deck crane need to be installed, which seriously restricts the construction period; by designing and processing the lifting frame device, the installation of the pier top section main beam is not affected by the construction of the upper beam. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 It is a structural schematic diagram of a front view of a hoisting device for a main beam of a cable-stayed bridge;

[0040] Figure 2 yes Figure 1 BB cross-sectional diagram;

[0041] Figure 3 It is a structural schematic diagram of a front view of a lifting frame of a lifting device for a main beam of a cable-stayed bridge;

[0042] Figure 4 yes Figure 3 AA cross-sectional structural diagram;

[0043] Figure 5It is a schematic diagram of the front view structure of a sliding device of a hoisting device for a main beam of a cable-stayed bridge;

[0044] Figure 6 It is a schematic diagram of the structure of a sliding device of a hoisting device for a main beam of a cable-stayed bridge from a top view;

[0045] Figure 7 It is a schematic diagram of a temporary support frame structure for a method of hoisting the main beam of a cable-stayed bridge;

[0046] Figure 8 yes Figure 7 BB cross-sectional structure diagram;

[0047] Fig. 9 It is a method for hoisting the main beam of a cable-stayed bridge, and a schematic diagram of the main view structure of the main beam of the pier top section;

[0048] Fig.10 yes Fig. 9 Schematic diagram of the longitudinal section of the middle bridge tower;

[0049] Fig.11 It is a method for hoisting the main beam of a cable-stayed bridge, and a schematic diagram of the main view structure of the hoisting cantilevered section main beam;

[0050] Fig.12 yes Fig.11 BB cross-sectional structure diagram;

[0051] Fig.13 It is a method for hoisting the main beam of a cable-stayed bridge, and a schematic diagram of the main view of the main beam of another cantilevered section is hoisted;

[0052] Fig.14 yes Fig.13 BB cross-sectional structure diagram;

[0053] Fig.15 The present invention is a structural schematic diagram of a top view of a bridge deck of a pier top section of a cable-stayed bridge main beam hoisting method.

[0054] Icons: 01-upper crossbeam; 02-lower crossbeam; 1-lifting frame; 11-truss; 111-upper crossbar; 112-lower crossbar; 113-diagonal brace; 12-winch; 13-pulley; 2-sliding device; 21-pier side bracket; 22-electric walking wheel; 23-slide rail; 3-pole beam; 4-tower crane; 5-temporary support frame; 61-pier top section main beam; 62-cantilever section main beam; 7-steel beam conversion platform. DETAILED DESCRIPTION

[0055] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0056] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0057] Example 1

[0058] like Figures 1 to 6 As shown, a cable-stayed bridge main beam hoisting device used in the present invention comprises a lifting frame 1 connected to the upper cross beam 01 of the diamond-shaped bridge tower of the cable-stayed bridge, a sliding device 2 arranged on the lower cross beam 02 of the bridge tower, and a tower crane 4 installed on the outer side along the width direction of the bridge tower. The lifting frame 1 is fixed to the top and bottom surfaces of the upper cross beam 01 by using a truss 11 through an upper cross bar 111 and a lower cross bar 112 with pre-buried anchors, and a diagonal brace 113 is fixed to the free ends of the upper cross bar 111 and the lower cross bar 112 by pinning them into a whole. The lifting frame 1 is a pulley 1 required for lifting. 3 and the shoulder pole beam 3 provide a connection basis. Connecting the shoulder pole beam 3 to the upper part of the pulley 13 can better balance the force of the pulley 13 and improve the stability during the lifting process. The pulley 13 adopts a five-door pulley group and a winch 12 for lifting; the sliding device 2 adopts pier side brackets 21 set up on both sides of the lower crossbeam, and then two sections of slide rails 23 are laid on it. The sliding plate is connected to the electric running wheel 22 and the bottom of the sliding plate is set at a height higher than the top surface of the lower crossbeam 02. The electric running wheel 22 is used to move the sliding plate to complete the movement of the main beam 6 along the width direction of the bridge tower.

[0059] When the hoisting device is in use, start the winch 12 to lower the traction rope, tie the main beam 6 with the guy rope and hang it on the hook, let the winch 12 retract the traction rope through the pulley 13 to lift the main beam 6 until it is higher than the lower cross beam 02, and then slowly place the main beam 6 on the sliding plate, move it to the designated position along the width direction of the bridge tower through the electric running wheel 22, then release the hook, remove the guy rope, and use the tower crane 4 to hoist the suspended section main beam 62 and connect it with the pier top section main beam 61.

[0060] Example 2

[0061] like Figures 7 to 15 As shown, this embodiment provides a method for hoisting a main beam of a cable-stayed bridge, comprising a hoisting device for a main beam of a cable-stayed bridge as described in Example 1, and comprising the following steps:

[0062] S1. Install lifting frame 1 and tower crane 4;

[0063] S2. Use the lifting frame 1 to lift all the pier top section main beams 61 until they are higher than the lower beam 02, and install the sliding device 2;

[0064] S3. Use the lifting frame 1 to lift all the pier top section main beams 61 and place them on the sliding device 2;

[0065] S4. Use the sliding device 2 to move one of the pier top section main beams 61 along the width direction of the bridge tower until it is located on the side of the bridge tower close to the tower crane 4; use the tower crane 4 to respectively hoist two sections of the cantilever section main beams 62 and connect them to the corresponding two ends of the pier top section main beam 61;

[0066] S5. Use the lifting frame 1 to lift the pier top section main beam 61 of the next section, and use the sliding device 2 to move the connection of the current pier top section main beam 61 as a whole until it is located on the side of the bridge tower away from the tower crane 4;

[0067] S6. Use the lifting frame 1 to lower the main beam 61 of the pier top section of the next section and place it on the sliding device 2;

[0068] S7. Repeat steps S4 to S6, so that both ends of the remaining pier top section main beam 61 are connected to the corresponding cantilever section main beam 62;

[0069] S8. Connect a vertical jack to the lower beam 02, lift all the pier top section main beams 61, and remove the sliding device 2; use the vertical jack to lift all the pier top section main beams 61, install the steel beams for temporary consolidation, and hang the inclined cable;

[0070] S9. construct the bridge deck and wet joints on the cantilever section main beam 62 and the pier top section main beam 61, install the steel beam conversion platform 7 on the pier top section main beam 61 near the tower crane 4, and use the tower crane 4 to lift the beam transport trolley and the bridge deck crane until they are placed on the pier top section bridge deck;

[0071] S10. Use the tower crane 4 to place the cantilevered main beam 62 to be spliced ​​on the beam transport trolley after the steel beam conversion platform 7 changes direction;

[0072] S11. Move the beam transport trolley to the preset position, use the bridge crane to hoist the cantilevered main beam 62 to be spliced ​​to the cantilever end of the spliced ​​cantilevered main beam 62, bolt the two connection ports in place, install the steel beam for temporary consolidation, hang the inclined cable, and construct the corresponding bridge deck and wet joint;

[0073] S12. Repeat steps S10 to S11 until the construction of the cable-stayed bridge deck is completed.

[0074] like Figure 3 and 4 As shown, after the construction of the bridge tower is completed, the lifting frame 1 is installed on the upper crossbeam 01 of the bridge tower, as shown in FIG. Figure 8 As shown, a temporary support frame 5 is set up on the cross beam under the bridge tower. The temporary support frame 5 is a frame structure. Figure 1As shown in the figure, a tower crane 4 is assembled on the outer side of the bridge tower in the width direction, and the two pier top section main beams 61 are lifted and placed on the temporary support frame 5 by the lifting frame 1. Figure 5 and 6 After the sliding device 2 is erected, the lifting frame 1 places the two pier top section main beams 61 on the sliding device 2, and then removes the temporary support frame 5. Fig. 9 and 10 As shown, one of the main beams 61 of the pier top section is lifted and placed on the sliding plate, and is moved to the edge of the bridge tower within ten meters of the tower crane 4 through the sliding plate, as shown in FIG. Fig.11 and 12 As shown, the tower crane 4 is used to hoist the cantilever section main beam 62 from the ground, and the connection port of the cantilever section main beam 62 is hoisted to the connection port of the pier top section main beam 61 to align, and a steel wire rope, a chain hoist, etc. are used to pull back at the other end of the pier top section main beam 61 to prevent the center of gravity from being unstable during the installation process and warping, and the two connection ports are fixed at the connection port with tension bolts; Fig.13 and 14 As shown, the cantilever section main beam 62 is hoisted and spliced ​​at the anti-tension side connection of the pier top section main beam 61 in the same way, and the anti-tension is removed after the splicing is completed. After both ends of the pier top section main beam 61 are connected to the cantilever section main beam 62, the lifting frame 1 is used to lift the pier top section main beam 61 to be spliced, and the spliced ​​pier top section main beam 61 is moved to the edge of the bridge tower within ten meters away from the tower crane 4 by the sliding device 2, and then the pier top section main beam 61 to be spliced ​​is placed on the sliding device 2 and spliced ​​according to the splicing method of the spliced ​​top section main beam 61.

[0075] Install two pairs of vertical jacks on the inner side of the sliding device 2 of the lower cross beam 02, use the vertical jacks to lift the two pier top section main beams 61, ensure that the bottom surface of the pier top section main beam 61 is higher than the top surface of the sliding device 2, and then remove the sliding device 2. After removal, use the vertical jacks to lift the two pier top section main beams 61, and drop the steel beam to the pier top section bracket; the falling height of the steel beam main longitudinal beam reaches 32cm, and the lifting height of the jack is insufficient, so it should be dropped in 2 or more times. During the falling process, use steel plates or steel sections to temporarily support the gap between the pier top section bracket and the steel beam main longitudinal beam to convert the system, so as to facilitate the vertical jack to lift up; remove the middle part of the pier top section bracket, leaving only the bracket at the main longitudinal beam. Use the tower crane 4 and the lifting frame 1 to install the remaining steel beam rods of the pier top section main beam 61 and the cantilever section main beam 62 in turn. After the steel structure of the beam section is installed, the construction steel beam is temporarily consolidated. Hang the first pair of inclined cables and initially tension them. After the initial tensioning is completed, the steel beam bridge deck and wet joints of the pier top section main beam 61 and the cantilever section main beam 62 are constructed.

[0076] like Fig.15As shown, a steel beam transfer platform 7 is installed on the main beam 61 of the pier top section near the tower crane 4, and the tower crane 4 is used to lift the beam transport trolley and the bridge crane until it is placed on the bridge deck of the pier top section. The tower crane 4 is used to lift the main beam 62 of the next section of the suspension section until it is placed on the steel beam transfer platform 7, and the lifting frame 1 is used to lift the main beam 62 of the next section of the suspension section that has been converted by the steel beam transfer platform 7 until it is placed on the beam transport trolley; the beam transport trolley is moved to the preset position, and the bridge crane is used to lift the main beam 62 of the suspension section to be spliced ​​to the cantilever end of the end of the spliced ​​main beam 62 of the suspension section, and the two connection ports are bolted in place, the steel beam is installed for temporary consolidation, the inclined cable is hung, and the corresponding bridge deck and wet joint are constructed; the above lifting and splicing process is repeated until the construction of the cable-stayed bridge deck is completed.

[0077] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A method for hoisting a main beam of a cable-stayed bridge, characterized in that: The invention comprises a lifting device, wherein the lifting device comprises a lifting frame (1), a sliding device (2) and a tower crane (4); the lifting frame (1) is arranged on an upper cross beam (01) of a diamond-shaped bridge tower, the lifting frame (1) is used to lift a pier top section main beam (61); the sliding device (2) is arranged on a lower cross beam (02) of the bridge tower, the sliding device (2) is used to move the pier top section main beam (61) along the width direction of the bridge tower; the tower crane (4) is arranged on one side along the width direction of the bridge tower, and the tower crane (4) is used to lift a cantilever section main beam (62); The lifting method includes the following steps: S1. Installing the lifting frame (1) and the tower crane (4); S2. Use the lifting frame (1) to lift all the pier top section main beams (61) until they are higher than the lower beam (02), and install the sliding device (2); S3. Use the lifting frame (1) to lift all the main beams (61) of the pier top section and place them on the sliding device (2); S4. Using the sliding device (2) to move one of the pier top section main beams (61) along the width direction of the bridge tower until it is located on the side of the bridge tower close to the tower crane (4); using the tower crane (4) to respectively hoist two sections of the cantilever section main beams (62) and connect them to the two ends of the corresponding pier top section main beams (61); S5. Use the lifting frame (1) to lift the pier top section main beam (61) to be spliced, and use the sliding device (2) to move the current connection of the pier top section main beam (61) as a whole until it is located on the side of the bridge tower away from the tower crane (4); S6. Use the lifting frame (1) to lower the current pier top section main beam (61) and place it on the sliding device (2); S7. Repeat steps S4 to S6, so that both ends of the remaining pier top section main beams (61) are connected to the corresponding cantilever section main beams (62).

2. A method for hoisting a main beam of a cable-stayed bridge according to claim 1, characterized in that: The lifting frame (1) comprises a truss (11), a winch (12) and a pulley (13); the truss (11) is fixed to the upper crossbeam (01); the truss (11) is used to suspend the pulley (13); and the winch (12) can retract and release a traction rope used for lifting through the pulley (13).

3. The method for hoisting a main beam of a cable-stayed bridge according to claim 2, characterized in that: The truss (11) comprises an upper crossbar (111), a lower crossbar (112) and an oblique brace (113); one end of the upper crossbar (111) and one end of the lower crossbar (112) are respectively fixed to the top surface and the bottom surface of the upper crossbeam (01); and the oblique brace (113) connects the free ends of the upper crossbar (01) and the lower crossbar (02).

4. The method for hoisting a main beam of a cable-stayed bridge according to claim 2, characterized in that: The pulley (13) comprises a multi-door pulley, and the truss (11) and the pulley (13) are connected via a shoulder beam (3).

5. A method for hoisting a main beam of a cable-stayed bridge according to any one of claims 2 to 4, characterized in that: The sliding device (2) comprises a pier-side bracket (21), an electric running wheel (22), a sliding rail (23) and a sliding plate. The pier-side bracket (21) is symmetrically arranged on both sides of the lower cross beam (02) and the pier-side bracket (21) is arranged along the thickness direction of the bridge tower. The sliding rail (23) is connected to the pier-side bracket (21). The sliding plate is slidably connected to the sliding rail (23) through the electric running wheel (22), and the bottom surface of the sliding plate is higher than the top surface of the lower cross beam (02).

6. The method for hoisting a main beam of a cable-stayed bridge according to claim 1, characterized in that: It also includes the following steps: S8. After step S7, a vertical jack is connected to the lower cross beam (02), all the main beams of the pier top section (61) are lifted, and the sliding device (2) is removed; all the main beams of the pier top section (61) are lifted back using the vertical jack, steel beams are temporarily consolidated, and inclined cables are hung; S9. constructing bridge decks and wet joints on the cantilever section main beam (62) and the pier top section main beam (61), installing a steel beam transfer platform (7) on the pier top section main beam (61) close to the tower crane (4), and using the tower crane (4) to lift the beam transport trolley and the bridge deck crane until they are placed on the pier top section bridge deck; S10. Using the tower crane (4), the cantilevered main beam (62) to be spliced ​​is placed on the beam transport trolley after the steel beam conversion platform (7) changes direction; S11. Move the beam transport trolley to a preset position, use the bridge crane to hoist the cantilevered main beam (62) to be spliced ​​to the cantilever end of the spliced ​​cantilevered main beam (62), bolt the two connection ports in place, install the steel beam for temporary consolidation, hang the inclined cable, and construct the corresponding bridge deck and wet joint; S12. Repeat steps S10 to S11 until the construction of the cable-stayed bridge deck is completed.

7. A method for hoisting a main beam of a cable-stayed bridge according to claim 6, characterized in that: Step S1 also includes setting up a temporary support frame (5) on the top of the lower cross beam (02), wherein the temporary support frame (5) is used to temporarily store the main beam, and the bottom surface of the temporary support frame (5) is higher than the top surface of the sliding device (2); in step S2, the lifting frame (1) is used to lift all the pier top section main beams (61) until they are higher than the lower cross beam (02), and the lifting frame (1) is used to lift all the pier top section main beams (61) until they are placed on the temporary support frame (5); After step S3, the temporary support frame (5) is removed.

8. The method for hoisting a main beam of a cable-stayed bridge according to claim 7, characterized in that: The temporary support frame (5) adopts a frame structure.

9. The method for hoisting a main beam of a cable-stayed bridge according to claim 6, characterized in that: The vertical jacks are evenly arranged on the lower cross beam (02) and symmetrically arranged on the inner side of the sliding device (2).

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