Ground anchor type suspension bridge girder support-free closure device and closure process

Abstract

The invention discloses a main beam support-free closure device of a ground anchor type suspension bridge and a closure process, and relates to the technical field of bridge closure, the main beam support-free closure device comprises a bearing platform and a cable bent tower arranged on the bearing platform, the cable bent tower is provided with a lower cross beam, the lower cross beam is provided with an approach bridge, the cable bent tower is provided with a main cable, the main cable is provided with a cable loading crane, and the cable loading crane is connected with the bridge. The cable crane is provided with a hoisting steel strand, the hoisting steel strand is provided with a hoisting sling, the cable bent tower is provided with a swing shifting system for shifting the first beam section, and the cable bent tower is provided with a suspension system for suspending the first beam section. The installation work of the first beam section and the second beam section on the suspension bridge and the closure work of the main beam of the suspension bridge are achieved through the swing shifting system and the suspension system which are arranged on the cable bent tower, a huge support system does not need to be laid, and therefore the construction efficiency of the suspension bridge is improved, the safety risk is reduced, and the cost is lower; the process has wide applicability to closure of the main span beam section of the river-crossing and sea-crossing ground anchor type suspension bridge.

Description

Technical Field

[0001] The invention relates to the technical field of suspension bridge closure, and in particular to a main beam bracket-free closure device and a closure process for a ground-anchored suspension bridge. Background Art

[0002] In bridge construction, regardless of the type of bridge, the main beam closure is the last step in the erection of the main beam. Its implementation effect can directly test the quality and accuracy of the erection of the main beam. Therefore, the main beam closure is a milestone and a key process in bridge erection. For super-large span suspension bridges with a length of more than a kilometer, the control of the main beam closure becomes particularly important due to its complex structural stress, more control factors and higher construction risks.

[0003] Suspension bridges are divided into ground-anchored suspension bridges and self-anchored suspension bridges according to whether they have anchors or not. In a self-anchored suspension bridge, the main cable is anchored on the main beam, and the main cable tension is balanced by the main beam's deadweight and the main beam's compressive bearing capacity, so that the main beam is always in a state of compression and bending. Therefore, the spanning capacity of the self-anchored suspension bridge is greatly limited, and the upper structure construction can only adopt the "beam first, cable later" process, that is, first the whole structure is erected to set up the support, and then the main beam is erected. After the main beam is erected, the main cable is erected, and the main beam and the main cable are connected with the sling, and finally the support is removed. The ground-anchored suspension bridge is completely different from it. Since the main cable transfers the load of the main beam to the anchor, there is no pressure between the main beams, the structural force is clear, and the strength and bearing capacity of the material can be fully utilized. Therefore, the spanning capacity of this type of bridge is greatly improved.

[0004] The overall plan for the traditional "tower area beam section" hoisting and closure is as follows:

[0005] ① Vertical lifting. After the temporary support of the "tower area beam section" is erected, the "No. 1 beam section" is lifted to the designed elevation by a cable-mounted crane;

[0006] ② Towing and swinging. Use a winch to pull and swing it to the top of the bracket;

[0007] ③ Beam drop. The cable-mounted crane and winch work together to slowly drop the beam section onto the bracket;

[0008] ④ Adjust the beam section. According to the design and monitoring requirements, the beam section is offset to the side of the side span by a certain distance (mainly to prevent the "joint beam section" from having a spatial conflict with it).

[0009] This process has the following four limitations:

[0010] (1) The area without slings needs to be supported by brackets, which requires a lot of materials and is costly;

[0011] (2) Long-span suspension bridges must take into account navigation requirements. To meet navigation clearance requirements, the erection and dismantling of supports must be very high, requiring a large amount of high-altitude work, which poses a high safety risk.

[0012] (3) The workload of erecting the support is large, which will lead to a long construction period for the "tower area beam section";

[0013] (4) The erected scaffolding occupies the construction site below the main tower, which will affect the normal construction of other processes around it.

[0014] For example, the publication number CN211665542U disclosed a slidable bracket limiting device for the displacement anchor span closure of a self-anchored suspension bridge on October 13, 2020, including a bracket fixedly mounted on the ground, a crossbeam supported at the top of the bracket, a vertical support provided on the crossbeam, an upper slideway slidably connected to the lower surface of the slidable bracket at the top of the bracket, and a gasket located between the bracket and the top surface of the crossbeam at the bottom of the bracket. When the above-mentioned disclosed bracket is used, the laying cost of the bracket is high, the closure process takes a long time, and the closure efficiency is low. Summary of the invention

[0015] The purpose of the present invention is to provide a main beam closure device and closure process without a support for a ground-anchored suspension bridge with higher construction efficiency. The present invention realizes the installation of the first beam segment and the second beam segment on the suspension bridge through a swing system and a suspension system arranged on a cable tower. The installation of the first beam segment and the second beam segment does not require the laying of a support, thereby improving the construction efficiency of the suspension bridge, reducing safety risks, and lowering costs.

[0016] To achieve the above-mentioned purpose, the technical solution adopted by the present invention to solve its technical problems is: a main beam bracket-free joint device for a ground-anchored suspension bridge, including a pedestal and a cable tower arranged on the pedestal, the cable tower is provided with a lower crossbeam, the lower crossbeam is provided with an approach bridge, the cable tower is provided with a main cable, the main cable is provided with a cable-mounted crane, the cable-mounted crane is provided with a lifting steel strand, the lifting steel strand is provided with a lifting sling, the cable tower is provided with a swing system for offsetting the No. 1 beam section, and the cable tower is provided with a suspension system for suspending the No. 1 beam section.

[0017] The swinging system includes a first winch arranged on the cable tower, a steering base is provided on the lower approach bridge, a first pulley group is provided on the cable tower, a traction rope is provided on the first winch, and the traction rope passes through the first pulley group, the steering base and the lifting equipment.

[0018] The suspension system includes a second winch connected to the cable tower, a temporary cable clamp is provided on the main cable, a second pulley group is provided on the temporary cable clamp, a temporary lifting lug is provided on the No. 1 beam section, a third pulley group is provided on the temporary lifting lug, and a temporary suspension rope is provided on the second winch, and the temporary suspension rope passes through the second pulley group and is connected to the third pulley group on the temporary lifting lug.

[0019] The temporary lifting lug is arranged at the intersection of the longitudinal and transverse partitions of the No. 1 beam section.

[0020] The temporary cable clamp is arranged just above the temporary lifting lug of the No. 1 beam section.

[0021] A temporary support for supporting the No. 1 beam section is provided on the lower cross beam.

[0022] The second pulley group is connected to the temporary cable clamp through a pin shaft, and the third pulley group is connected to the temporary lifting lug through a pin shaft.

[0023] A main beam closure process without a support for a ground-anchored suspension bridge, using the main beam closure device without a support for a ground-anchored suspension bridge, specifically comprising the following steps:

[0024] Step 1: Pull the traction rope on the first hoist on the cable tower through the first pulley and connect it to the steering base of the approach bridge, and temporarily fix one end of the traction rope; the cable-mounted crane moves to the top of the No. 1 beam section, and lowers the lifting device to the top of the No. 1 beam section through the lifting steel strand, and connects it to the No. 1 beam section;

[0025] Step 2: After the lifting device is connected to the No. 1 beam section, the cable-mounted crane works to lift the No. 1 beam section slowly and uniformly to the top of the lower beam of the cable tower, separate the traction rope from the steering base, and pass the traction rope through the steering base to connect it to the end of the lifting device to form a swinging system;

[0026] Step 3: Start the first winch, tighten the traction rope of the swinging system, swing the No. 1 beam section to the top of the upper beam, and leave a certain pre-deflection amount L according to the design and monitoring requirements;

[0027] Step 4: Connect the suspension system to the temporary lifting lug of the No. 1 beam section, start the second winch to tighten the temporary suspension rope, separate the traction rope from the lifting sling and connect it to the No. 1 beam section, move the cable-mounted crane to the top of the No. 2 beam section, lower the lifting sling to the top of the No. 2 beam section through the lifting steel strand, and connect it to the No. 2 beam section;

[0028] Step 5: After the lifting device is connected to the No. 2 beam section, the cable-mounted crane starts to work, slowly and evenly lifts the No. 2 beam section to the designed elevation, installs the sling and connects it to the No. 3 beam section;

[0029] Step 6: After the No. 2 beam section is installed with slings and connected to the No. 1 beam section, the lifting sling is untied and the cable-mounted crane moves to the top of the No. 1 beam section;

[0030] Step 7: After the cable-mounted crane moves to the top of the No. 1 beam section, the lifting device is lowered to the top of the No. 1 beam section through the lifting steel strand and connected to the No. 1 beam section; the first winch is started to release the traction rope of the swing system to eliminate the pre-bias L;

[0031] Step 8. After eliminating the pre-bias L, adjust the No. 1 beam section to the designed line shape through the lifting equipment and suspension system of the cable-mounted crane, and then weld the No. 1 beam section to the No. 2 beam section. After welding, dismantle the suspension system and remove the cable-mounted crane.

[0032] When the upper structure of the approach bridge is erected, the embedded parts of the steering base are buried.

[0033] The beneficial effects of the present invention are:

[0034] The installation of the No. 1 beam section and the No. 2 beam section on the suspension bridge is achieved through the swing system and suspension system set on the cable tower. The closure of the main beam of the suspension bridge does not require the laying of a huge support system, thereby improving the construction efficiency of the suspension bridge, reducing safety risks, and lowering costs. This technology is widely applicable to the closure of the main span beam sections of ground-anchored suspension bridges across rivers and seas;

[0035] The swinging system, which is composed of the first winch, the steering base, the first pulley group and the traction rope, can conveniently perform the offset work of the No. 1 beam section after it is moved to the specified position, and the cooperation of the second winch, the temporary cable clamp, the second pulley group, the temporary lifting lug, the third pulley group and the temporary suspension rope can facilitate the stable suspension of the No. 1 beam section after the offset, thereby facilitating the cable-mounted crane to install the No. 2 beam section. The swinging and suspension work of the No. 1 beam section is convenient, fast and easy to use. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The present invention is a schematic diagram of the structure of the swing system of the main beam support-free closure device of the ground-anchored suspension bridge.

[0037] Figure 2 This is a schematic diagram of the suspension system structure of the main beam bracketless closure device of the ground-anchored suspension bridge.

[0038] Figure 3 This is a top view of the No. 1 beam section at the lower crossbeam.

[0039] Figure 4 This is the elevation layout drawing of the tower area beam section before installation.

[0040] Figure 5 The present invention is a schematic diagram of step 1 of a main beam bracket-free closure process for a ground-anchored suspension bridge.

[0041] Figure 6 This is a schematic diagram of step 2 of a main beam unsupported closure process for a ground-anchored suspension bridge.

[0042] Figure 7 The present invention is a schematic diagram of step three of a main beam bracketless closure process for a ground-anchored suspension bridge.

[0043] Figure 8 The present invention is a schematic diagram of step 4 of a main beam bracketless closure process for a ground-anchored suspension bridge.

[0044] Fig. 9 This is a schematic diagram of step five of a main beam unsupported closure process for a ground-anchored suspension bridge.

[0045] Fig.10 The present invention is a schematic diagram of step six of a main beam bracketless closure process for a ground-anchored suspension bridge.

[0046] Fig.11 The diagram is a schematic diagram of step seven of a main beam unsupported closure process for a ground-anchored suspension bridge.

[0047] Fig.12 The present invention is a schematic diagram of step eight of a main beam bracketless closure process for a ground-anchored suspension bridge.

[0048] In the attached figure: 1- pedestal, 2- cable tower, 3- lower crossbeam, 4- main cable, 5- cable-carrying crane, 6- lifting steel strand, 7- lifting sling, 8- beam section No. 1, 9- first winch, 10- steering base, 11- first pulley group, 12- traction rope, 13- second winch, 14- temporary cable clamp, 15- second pulley group, 16- temporary lifting lug, 17- third pulley group, 18- temporary suspension rope, 19- beam section No. 2, 20- approach bridge, 21- temporary support. DETAILED DESCRIPTION

[0049] 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 intended to limit the present invention.

[0050] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0051] In order to make the force of the entire suspension bridge structure clear and reduce the negative bending moment of the main beam support, the design sets the first beam section close to the tower area as a beam section without slings (referred to as "beam section No. 1", the same below); the joint section is the second beam close to the tower area (referred to as "beam section No. 2" or "joined beam section", the same below). This patent is aimed at the hoisting and jointing innovation of "beam section No. 1" and "beam section No. 2" (referred to as "tower area beam section", the same below). Without loss of generality, the status of the tower area beam section at this time is as follows Figure 4 As shown in the figure, except for the beam section in the tower area, the rest of the beam sections have been hoisted. Figure 4 As a reference state, the installation of the "tower area beam section" is explained in detail. When closing the beam, the No. 1 beam section 8 and the No. 2 beam section 19 need to be installed between the lower cross beam 3 and the No. 3 beam section. When installing, the No. 2 beam section 19 not only needs to be welded to the two ends 8 of the No. 1 beam section and the No. 3 beam section, but also needs to be connected to the main cable 1 through a sling.

[0052] like Figure 1-12 As shown, a main beam closure device and closure process without a support for a ground-anchored suspension bridge include a cap 1 and a cable tower 2 arranged on the cap 1, a lower crossbeam 3 is arranged on the cable tower 2, a bridge approach 20 is arranged on the lower crossbeam 3, a main cable 4 is arranged on the cable tower 2, a cable-mounted crane 5 is arranged on the main cable 4, a lifting steel strand 6 is arranged on the cable-mounted crane 5, a lifting sling 7 is arranged on the lifting steel strand 6, a swing system for offsetting the No. 1 beam section 8 is arranged on the cable tower 2, and a suspension system for suspending the No. 1 beam section 8 is arranged on the cable tower 2.

[0053] When closing the bridge, the cable-mounted crane 5 works so that the lifting steel strand 6 drives the lifting device 7 to move to the No. 1 beam section 8 and moves the No. 1 beam section 8 to the specified position. At this time, the swing system works so that the No. 1 beam section 8 is offset and falls on the lower cross beam 3. At this time, the suspension system is connected with the No. 1 beam section 8 to realize the suspension of the No. 1 beam section 8. The lifting device 7 is separated from the No. 1 beam section 8, and the lifting device 7 is moved by the cable-mounted crane 5 to connect with the No. 2 beam section 19. After moving the No. 2 beam section 19 to the specified position, it is connected with the No. 3 beam section and the No. 2 beam section 19 is connected to the main cable 4 through the sling. At this time, the lifting sling 7 is separated from the No. 2 beam section 19, and the lifting sling 7 is reconnected with the No. 1 beam section 8. At this time, the swing system works to eliminate the offset of the No. 1 beam section, so that the No. 1 beam section 8 is adjusted to the specified position with the cooperation of the swing system and the suspension system, and the No. 1 beam section 8 is welded with the No. 2 beam section 19 to achieve the closure work. The installation work of the entire No. 1 beam section 8 and the No. 2 beam section 19 does not require the laying of a huge support system, thereby improving the construction efficiency of the suspension bridge, reducing safety risks, and lowering costs. This process is widely applicable to the closure of the main span beam sections of anchored suspension bridges across rivers and seas.

[0054] Reference Figure 1The swinging system includes a first winch 9 arranged on the cable tower 2, a steering base 10 is provided on the lower approach bridge 20, a first pulley group 11 is provided on the cable tower 2, and a traction rope 12 is provided on the first winch 9. The traction rope 12 passes through the first pulley group 11, the steering base 10 and the lifting sling 7 to be connected. When the cable-mounted crane 5 lifts the No. 1 beam section 8 to the designed height, the traction rope 12 passes through the first pulley group 11, the steering base 10 and the lifting sling 7 to be connected, and then the traction rope 10 is wound around the first pulley group 11 for many times by the first winch 9, thereby forming a swinging system. Specifically, the traction rope 12 is a steel wire rope, wherein the models of the pulleys and the steel wire ropes and the number of windings are all required to be selected through calculation. When the first winch 9 works, the traction rope 10 moves under the support of the first steering car 11 and the steering base 10, and then the traction rope 10 drives the lifting sling 7 and the No. 1 beam section 8 to move, thereby realizing the displacement of the No. 1 beam section 8 and falling on the lower beam 3.

[0055] Reference Figure 2 The suspension system includes a second hoist 13 connected to the cable tower 2, a temporary cable clamp 14 is provided on the main cable 4, a second pulley block 15 is provided on the temporary cable clamp 14, a temporary lifting lug 16 is provided on the first beam section 8, a third pulley block 17 is provided on the temporary lifting lug 16, a temporary suspension rope 18 is provided on the second hoist 13, the temporary suspension rope 18 passes through the second pulley block 15 and is connected to the third pulley block 17 on the temporary lifting lug 16, and the second hoist 13 repeatedly winds the steel wire rope around the second pulley block 16. A temporary sling is formed on the car group 15 and the third pulley group 17. Specifically, the temporary suspension rope 18 is a steel wire rope, wherein the models of the pulleys and the steel wire rope and the number of windings must be selected through calculation. When it is necessary to suspend the No. 1 beam section 8, the second pulley group 17 is connected to the temporary lifting ear 16 on the No. 1 beam section 8. At this time, the second winch 13 works to tighten the temporary suspension rope 18. At this time, one end of the No. 1 beam section 8 is suspended, and the other end of the No. 1 beam section 8 falls on the lower crossbeam 3.

[0056] Specifically, the first hoist 9 and the second hoist 13 are installed on the tower 2 by bolts.

[0057] Reference Figure 3 The temporary lifting lug 16 is arranged at the intersection of the longitudinal and transverse partitions of the No. 1 beam section 8, so as to increase the strength of the connection between the temporary lifting lug 16 and the No. 1 beam section 8, and the No. 1 beam section 8 is provided with a lifting lug A connected to the lifting sling 7, and the temporary lifting lug 16 has the same structure as the lifting lug A. In this embodiment, two temporary lifting lugs 16 are provided and four lifting lugs A are provided, and the two temporary lifting lugs 16 are arranged on the outermost side of the No. 1 beam section 8.

[0058] Reference Figure 2The temporary cable clamp 14 is arranged just above the temporary lifting ear 16 of the No. 1 beam section 8. When the No. 1 beam section 8 falls on the lower cross beam 3, the temporary cable clamp 14 is arranged just above the temporary lifting ear 16 of the No. 1 beam section 8, thereby ensuring that the temporary suspension rope 18 between the temporary cable clamp 14 and the temporary lifting ear 16 is in a vertical device, thereby ensuring the stable suspension of the No. 1 beam section 8.

[0059] A temporary support 21 for supporting the No. 1 beam section 8 is provided on the lower cross beam 3. By setting the temporary support 21 and stably placing the No. 1 beam section 8 on the lower cross beam 3, the lower cross beam 3 and the No. 1 beam section 8 are protected, and the subsequent adjustment of the No. 1 beam section 8 is facilitated.

[0060] The second pulley block 15 is connected to the temporary cable clamp 14 via a pin shaft, thereby realizing convenient disassembly and assembly of the second pulley block 15 , and the third pulley block 17 is connected to the temporary lifting lug 16 via a pin shaft, thereby realizing convenient disassembly and assembly of the third pulley block 17 .

[0061] Specifically, they are generally arranged in the order of "swinging system first, then suspension system", and both need to be in place before the "No. 1 beam section" is erected.

[0062] For swing systems:

[0063] ① When the upper structure of the approach bridge 20 is erected, the 10 embedded parts of the turning base are buried;

[0064] ② After that, the welding of the steering base 10, the installation of the cable-mounted crane 5 and the first hoist 9 are completed;

[0065] ③ Before the No. 1 beam section 8 is lifted, the traction rope 10 is connected to the lifting sling 7, and the rest is set up;

[0066] ④ When the No. 1 beam section 8 is lifted to the designed swing elevation, the traction rope 10 is connected to the lifting sling 7 to form a swing system.

[0067] For suspension systems:

[0068] ① Before the cable-carrying crane 5 moves to the first beam section 8, the temporary cable clamp 14 is fixed to the main cable 2;

[0069] ② After that, the second pulley block 15, the third pulley block 17 and the second hoist 13 are installed and a temporary sling is formed;

[0070] ③ After the No. 1 beam segment 8 is swung to the designed position above the lower cross beam 3 of the cable tower 2 by the swing-shift system (the beam segment needs to be pre-biased to the side span by a certain distance according to the design requirements, and one end of the beam segment falls on the temporary support 21), the temporary suspension rope 18 is connected to the temporary lifting ear 16 of the No. 1 beam segment 8 to form a suspension system.

[0071] A main beam closure process without a support for a ground-anchored suspension bridge, using the main beam closure device without a support for a ground-anchored suspension bridge, referring to Figure 5-12 , the specific steps are as follows:

[0072] Step 1, pull the traction rope 12 on the first hoist 9 on the cable tower 2 through the first pulley 11 and onto the steering base 10 to the approach bridge 20, and temporarily fix one end of the traction rope 12; the cable-mounted crane 5 moves to the top of the No. 1 beam section 8, and lowers the lifting sling 7 to the top of the No. 1 beam section 8 through the lifting steel strand 6, and connects with the No. 1 beam section 8. Specifically, at this time, the lifting sling 7 is connected to the lifting lug A on the No. 1 beam section 8. Specifically, a pulley can also be provided on the steering base 10 to facilitate the convenient movement of the traction rope 12 on the steering base 10, and a shackle is provided at the end of the traction rope 12 to realize the connection between the traction rope 12 and the steering base 10, or a detachable buckle is provided at the end of the traction rope 12 to realize the connection between the traction rope and the steering base 10;

[0073] Step 2: After the lifting sling 7 is connected to the first beam section 8, the cable crane 5 starts to work, and the first beam section 8 is lifted slowly and uniformly to the top of the lower beam 3 of the cable tower 2, and the traction rope 12 is separated from the steering base 10, and the traction rope 12 is passed through the steering base 10 and connected to the end of the lifting sling 7 to form a swinging system. Specifically, the connection with the lifting sling 7 is realized by the shackle provided at the end of the traction rope 12;

[0074] Step 3: Start the first hoist 9, tighten the traction rope 12 of the swinging system, swing the beam section 8 to the top of the upper beam 8, and leave a certain pre-bias L according to the design and monitoring requirements. Specifically, in this embodiment, the specific vertical pre-bias L is 50 cm;

[0075] Step 4: Connect the suspension system to the temporary lifting lug 16 of the No. 1 beam section 8, start the second hoist 13 to tighten the temporary suspension rope 18, separate the traction rope 12 from the lifting sling 7 and connect it to the No. 1 beam section 8, move the cable-carrying crane 5 to the top of the No. 2 beam section 19, lower the lifting sling 7 to the top of the No. 2 beam section 19 through the lifting steel strand 6, and connect it to the No. 2 beam section 19. Specifically, the connection work with the lifting lug A on the No. 1 beam section 8 is realized through the shackle at the end of the traction rope 12;

[0076] Step 5: After the lifting device 7 is connected to the No. 2 beam section 19, the cable-carrying crane 5 starts to work, slowly and evenly lifts the No. 2 beam section 19 to the designed elevation, installs the sling and connects it to the No. 3 beam section. Specifically, the No. 2 beam section 19 is welded to the No. 3 beam section;

[0077] Step 6: After the No. 2 beam section 19 is installed with a sling and connected to the No. 3 beam section, the lifting sling 7 is untied, and the cable-mounted crane 5 moves to the top of the No. 1 beam section 8;

[0078] Step 7: After the cable-mounted crane 5 moves to the top of the No. 1 beam section 8, the lifting device 7 is lowered to the top of the No. 1 beam section 8 through the lifting steel strand 6 and connected to the No. 1 beam section 8; the first hoist 9 is started to release the traction rope 12 of the swinging system to eliminate the pre-bias L;

[0079] Step 8: After eliminating the pre-bias L, adjust the No. 1 beam section 8 to the designed line shape through the lifting device 7 and suspension system of the cable crane 5, and then weld the No. 1 beam section 8 to the No. 2 beam section 19. After the welding is completed, dismantle the suspension system and remove the cable crane 5. Specifically, dismantle the swing system. Specifically, after the No. 1 beam section 8 and the No. 2 beam section 19 are installed, Fig.12 shown.

[0080] The above description is only a preferred embodiment of the present invention and is 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 main beam bracket-free closure device for a ground-anchored suspension bridge, comprising a cap (1) and a cable tower (2) arranged on the cap (1), the cable tower (2) being provided with a lower crossbeam (3), the lower crossbeam (3) being provided with an approach bridge (20), the cable tower (2) being provided with a main cable (4), the main cable (4) being provided with a cable-mounted crane (5), the cable-mounted crane (5) being provided with a lifting steel strand (6), the lifting steel strand (6) being provided with a lifting sling (7), characterized in that: The cable tower (2) is provided with a swing system for shifting the first beam section (8), and the cable tower (2) is provided with a suspension system for suspending the first beam section (8).

2. The main beam bracket-free closure device for a ground-anchored suspension bridge according to claim 1, characterized in that: The swinging system comprises a first winch (9) arranged on a cable tower (2), a steering base (10) is arranged on the lower approach bridge (20), a first pulley group (11) is arranged on the cable tower (2), a traction rope (12) is arranged on the first winch (9), and the traction rope (12) passes through the first pulley group (11), the steering base (10) and is connected to the lifting sling (7).

3. The main beam bracket-free closure device for a ground-anchored suspension bridge according to claim 2, characterized in that: The suspension system comprises a second winch (13) connected to the cable tower (2); a temporary cable clamp (14) is provided on the main cable (4); a second pulley group (15) is provided on the temporary cable clamp (14); a temporary lifting lug (16) is provided on the first beam section (8); a third pulley group (17) is provided on the temporary lifting lug (16); the second winch (13) is provided with a temporary suspension rope (18); the temporary suspension rope (18) passes through the second pulley group (15) and is connected to the third pulley group (17) on the temporary lifting lug (16).

4. The main beam bracket-free closure device for a ground-anchored suspension bridge according to claim 3, characterized in that: The temporary lifting lug (16) is arranged at the intersection of the longitudinal and transverse partitions of the first beam section (8).

5. The main beam bracket-free closure device for a ground-anchored suspension bridge according to claim 3, characterized in that: The temporary cable clamp (14) is arranged just above the temporary lifting lug (16) of the first beam section (8).

6. The main beam bracket-free closure device for a ground-anchored suspension bridge according to claim 3, characterized in that: The lower cross beam (3) is provided with a temporary support (21) for supporting the first beam section (8).

7. The main beam bracket-free closure device for a ground-anchored suspension bridge according to claim 3, characterized in that: The second pulley group (15) is connected to the temporary cable clamp (14) via a pin shaft, and the third pulley group (17) is connected to the temporary lifting lug (16) via a pin shaft.

8. A main beam closure process without a support for a ground-anchored suspension bridge, using the main beam closure device without a support for a ground-anchored suspension bridge as claimed in any one of claims 1 to 7, characterized in that: The specific steps are as follows: Step 1: Pull the traction rope (12) on the first hoist (9) on the cable tower (2) through the first pulley (11) and connect it to the steering base (10) of the approach bridge (20), and temporarily fix one end of the traction rope (12); the cable-mounted crane (5) moves to the top of the No. 1 beam section (8), and lowers the lifting device (7) to the top of the No. 1 beam section (8) through the lifting steel strand (6), and connects it to the No. 1 beam section (8); Step 2: After the lifting sling (7) is connected to the first beam section (8), the cable-mounted crane (5) is operated to slowly and uniformly lift the first beam section to the top of the lower crossbeam (3) of the cable tower (2), separate the traction rope (12) from the steering base (10), and pass the traction rope (12) through the steering base (10) to connect with the end of the lifting sling (7), so as to form a swinging system; Step 3: Start the first winch (9), tighten the traction rope (12) of the swinging system, swing the first beam section (8) to the top of the upper beam (8), and leave a certain pre-deflection amount L according to the design and monitoring requirements; Step 4: Connect the suspension system to the temporary lifting lug (16) of the No. 1 beam section (8), start the second winch (13) to tighten the temporary suspension rope (18), separate the traction rope (12) from the lifting sling (7) and connect it to the No. 1 beam section (8), move the cable-mounted crane (5) to the top of the No. 2 beam section (19), lower the lifting sling (7) to the top of the No. 2 beam section (19) through the lifting steel strand (6), and connect it to the No. 2 beam section (19); Step 5: After the lifting device (7) is connected to the second beam section (19), the cable-mounted crane (5) is operated to lift the second beam section (19) to the designed elevation at a uniform speed and slowly, and the sling is installed and connected to the beam section (3); Step 6: After the No. 2 beam section (19) is installed with a sling and connected to the No. 3 beam section, the lifting sling (7) is released, and the cable-mounted crane (5) moves to the top of the No. 1 beam section (8); Step 7: After the cable-mounted crane (5) moves to the top of the No. 1 beam section (8), the lifting device (7) is lowered to the top of the No. 1 beam section (8) through the lifting steel strand (6) and connected to the No. 1 beam section (8); the first winch (9) is started to release the traction rope (12) of the swing system to eliminate the pre-bias L; Step 8: After eliminating the pre-bias L, adjust the No. 1 beam section (8) to the designed line shape through the lifting device (7) and suspension system of the cable-mounted crane (5), and then weld the No. 1 beam section (8) and the No. 2 beam section (19). After the welding is completed, dismantle the suspension system and remove the cable-mounted crane (5).

9. The main beam closure process of a ground-anchored suspension bridge without a support according to claim 7, characterized in that: When the upper structure of the approach bridge (20) is erected, the embedded parts of the steering base (10) are embedded.

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