A construction method for cable-stayed bridges based on climbing formwork and cantilever casting with support formwork.

Abstract

This invention discloses a construction method for a cable-stayed bridge based on the climbing formwork method and the cantilever casting method using a support formwork, belonging to the field of cable-stayed bridge construction technology. The specific steps include: S1: main tower foundation construction; S2: climbing formwork support installation; S3: top formwork installation; S4: main tower construction using the climbing formwork method; S5: top formwork casting; S6: main beam construction using the cantilever casting method. By connecting the top formwork to the climbing formwork support, the climbing formwork support can move the top formwork to a predetermined height during climbing, thus facilitating the casting operation of the top formwork. Therefore, when supporting the top formwork, the support operation can be completed at a lower level, and then moved to the design height by the climbing formwork support. Because the support construction height is low, it is convenient to hoist and install the formwork, which can speed up the construction progress.

Description

Technical Field

[0001] This invention belongs to the field of cable-stayed bridge construction technology, specifically relating to a cable-stayed bridge construction method based on the climbing formwork method and the cantilever casting method using support baskets. Background Technology

[0002] A cable-stayed bridge is a type of bridge where the main girder is directly supported by cables to the bridge towers. It is a structural system composed of compression-bearing towers, tension-bearing cables, and bending-resistant girder sections. It can be viewed as a multi-span, elastically supported continuous beam where cables replace piers. This reduces bending moments within the girder, lowers the building height, reduces structural weight, and saves building materials.

[0003] The conventional construction method for cable-stayed bridges is to construct the towers first, followed by the main girder. With the development of science and technology, more and more methods have emerged for cable-stayed bridge construction. Optimizing the construction process and improving construction progress and technical levels are of positive significance for cable-stayed bridge construction. Among these methods, simultaneous tower-girder construction is a new approach, where the main girder and main tower are constructed simultaneously after the main tower has reached a certain height. Compared to traditional methods, simultaneous construction shortens the construction period, saves costs, and thus creates significant economic value.

[0004] Currently, when using the synchronous construction method, the top of the main tower needs to be poured on the main tower pier. Therefore, after the main tower pier is completed, formwork needs to be erected at its end to pour the top of the main tower. Since the main tower pier is high, the formwork needs to be hoisted multiple times during the formwork erection, which can easily slow down the construction progress. Summary of the Invention

[0005] To address the issue that the main tower piers are relatively high, requiring multiple hoisting of formwork during formwork erection, which can slow down the construction progress, the present invention aims to provide a cable-stayed bridge construction method based on the climbing formwork method and the cantilever casting method with support baskets, in order to solve the aforementioned problems.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a construction method for a cable-stayed bridge based on the climbing formwork method and the cantilever casting method with support points, the specific steps of which include:

[0007] S1: Construction of the main tower foundation;

[0008] S2: Installation and construction of climbing formwork support;

[0009] S3: Top formwork installation;

[0010] S4: The climbing formwork method is used for the construction of the main tower;

[0011] S5: Top formwork pouring construction;

[0012] S6: The main beam is constructed using the hanging basket method.

[0013] As a preferred embodiment, in step S1, before constructing the main tower base, the excavation location of the foundation pit needs to be marked out and measured before the base can be poured. When pouring a large base, the skip-pour method needs to be used. During construction, the concrete needs to be poured using a chute, and after pouring, the concrete needs to be vibrated to remove air bubbles. After the base has been placed for 7-10 days, the bottom of the main tower can be constructed on the base. During construction, the bottom of the main tower is constructed to the preset height using a formwork construction process.

[0014] As a preferred embodiment, in step S2, before installing the climbing formwork support, it is necessary to ensure that the strength of the concrete at the bottom of the main tower reaches 15-25MPa. When installing the climbing formwork support, the outer enclosure needs to be installed simultaneously, and the height of the outer enclosure needs to be higher than the operating surface. When the climbing formwork support is connected to the through-wall bolt rod, double nuts are required for fixing. After the double nuts are pre-tightened, the exposed length of the through-wall bolt rod after passing through the double nuts should not be less than 1cm.

[0015] As a preferred embodiment, in step S3, when installing the top formwork, the top formwork template needs to be installed on the climbing formwork support so that the top formwork template is located above the formwork of the main tower pouring area, and the top formwork needs to be constructed symmetrically with the main tower as the axis.

[0016] The specific steps for top formwork installation include:

[0017] S301: Install fan-shaped brackets on the climbing formwork support, so that the fan-shaped brackets are located at the upper end of the climbing formwork support and the fan-shaped brackets are symmetrically arranged;

[0018] S302: Install the bottom formwork on the fan-shaped bracket and tie the bottom plate reinforcement;

[0019] S303: Install two side forms symmetrically on the fan-shaped bracket and tie the web reinforcement;

[0020] S304: Install the inner mold above the bottom mold and between the two side molds;

[0021] S305: Tie the top slab reinforcement above the inner formwork and the two side formworks;

[0022] S306: Install end molds at both ends of the bottom mold, inner mold, and two side molds.

[0023] As a preferred embodiment, in step S4, when using the climbing formwork method for construction, after the concrete is poured and formed and the formwork is removed, a wall-attachment device needs to be installed at the pre-embedded position of the hydraulic climbing formwork to ensure that the wall-attachment device is in full contact with the concrete surface and that the fixing sleeve completely covers the load-bearing range of the wall-attachment seat. Before the guide rail is raised, it needs to be inspected and cleaned to ensure that there are no obstacles on the guide rail that would hinder its raising. In addition, the concrete of the climbing layer also needs to be tested before the climbing formwork support is raised, so that the concrete strength needs to reach 15-25MPa.

[0024] In a preferred embodiment, in step S5, after the climbing formwork support climbs to a preset height, and the top formwork is positioned at the preset height, the bottom plate, web plate, and top plate can be poured. Furthermore, when the concrete is cured to a structural strength of 15-25 MPa, prestressing tensioning of the concrete is required.

[0025] As a preferred embodiment, in step S6, the specific steps of the hanging basket method construction include:

[0026] S601: Install the hanging basket travel track at the top of the main tower. The two hanging basket travel tracks need to be kept parallel and a stable connection between the hanging basket travel track and the top of the main tower needs to be ensured.

[0027] S602: Assemble the hanging basket diamond frame and install it on the hanging basket travel track. The hanging basket diamond frame needs to be moved to the top of the main tower by hoisting equipment. After the two hanging basket diamond frames are placed on the two hanging basket travel tracks, the two hanging basket diamond frames need to be temporarily fixed with a hand chain hoist to ensure the stability of the hanging basket diamond frame. After the hanging basket diamond frame is connected to the hanging basket travel mechanism, the machine casing will remove the hand chain hoist.

[0028] S603: Install crossbeams on the two hanging basket rhomboid frames to form a whole. The crossbeams can connect the two hanging basket rhomboid frames, enabling the two hanging basket rhomboid frames to move synchronously, thus improving stability and safety.

[0029] S604: Install the hanging basket anchoring system to anchor it to the concrete beam segment at the top of the main tower. The anchoring system can ensure the connection between the hanging basket rhomboid frame and the top of the main tower while ensuring the movement of the hanging basket rhomboid frame, thereby improving the stability of the hanging basket rhomboid frame.

[0030] S605: Erects the upper crossbeam, front sling, lower crossbeam and bottom formwork support of the hanging basket, which can complete the installation of the hanging basket and the installation of the bottom formwork support located under the main beam, so that the bottom formwork support forms a working platform.

[0031] S606: Install the hanging basket bottom mold on the bottom mold support;

[0032] S607: Install the sliding beams and side molds of the hanging basket on both sides of the bottom mold support;

[0033] S608: Pre-compress the installed bottom and side molds of the hanging basket. Pre-compression can improve the stability of the bottom and side molds of the hanging basket.

[0034] S609: Install and fix the inner formwork sliding beam of the hanging basket;

[0035] S6010: Tie the bottom slab reinforcement and web reinforcement on the bottom formwork and side formwork of the hanging basket;

[0036] S6011: Install the inner formwork of the hanging basket and tie the steel reinforcement of the top plate of the hanging basket;

[0037] S6012: After the top slab reinforcement is tied, install the hanging basket end formwork at the ends of the bottom formwork, top formwork, and inner formwork of the hanging basket. Concrete can be poured after the hanging basket end formwork is installed.

[0038] S6013: After the concrete reaches the preset strength, that is, when the structural concrete strength is greater than 15MPa, remove the end formwork of the hanging basket and demold the bottom formwork, side formwork and inner formwork of the hanging basket. By controlling the diamond-shaped frame of the hanging basket, the bottom formwork, side formwork and inner formwork of the hanging basket can be separated from the main beam after pouring, which facilitates the demolding operation of the bottom formwork, side formwork and inner formwork of the hanging basket and makes it more convenient.

[0039] S6014: Install the hanging basket travel track on the poured concrete beam segment and remove the anchoring system. This allows the hanging basket travel mechanism to be installed on the newly poured main beam, facilitating the forward movement of the hanging basket rhombus frame. Removing the anchoring system also facilitates the long-distance movement of the hanging basket rhombus frame.

[0040] S6015: Move the hanging basket diamond frame so that it can move the hanging basket bottom formwork, hanging basket side formwork and hanging basket inner formwork. After moving, the hanging basket diamond frame is fixed by the anchoring system. When the hanging basket diamond frame is moved to the hanging basket traveling mechanism on the newly poured main beam, the hanging basket diamond frame can drive the hanging basket bottom formwork, hanging basket side formwork and hanging basket inner formwork to one end of the main beam.

[0041] S6016: Lift the bottom formwork, side formwork, and inner formwork of the hanging basket to move them to the predetermined position for steel reinforcement binding and concrete pouring. The diamond-shaped structure of the hanging basket can lift the bottom formwork, side formwork, and inner formwork, allowing them to reach the predetermined position for subsequent steel reinforcement binding.

[0042] In a preferred embodiment, in step S6013, after the concrete reaches the preset strength, the beam segment needs to be prestressed and tensioned, and the beam segment needs to be tested before the installation of the hanging basket traveling track can be carried out.

[0043] As a preferred implementation, in step S6, when constructing the main beam using the hanging basket method, the main beams on both sides of the tower column need to be constructed simultaneously to ensure that the tower column remains balanced, and the construction length of the main beam on one side of the tower column needs to be less than half the distance between the two tower columns.

[0044] In a preferred embodiment, in step S6, when the main beams on the two tower columns reach the predetermined span, the main beams need to be closed. During closure, a hanging basket on one main beam can be used. Before pouring concrete, prestressed pipes need to be installed at the closure joint, and equal weight counterweights are added on both sides of the closure joint. The equal weight counterweights can be disassembled when pouring concrete.

[0045] Compared with the prior art, the beneficial effects of the present invention are:

[0046] This cable-stayed bridge construction method based on climbing formwork and fulcrum hanging basket cantilever construction connects the top formwork with the climbing formwork support, allowing the climbing formwork support to move the top formwork to a predetermined height during the climbing process, thus facilitating the pouring operation of the top formwork. Therefore, when supporting the top formwork, the support work can be completed at a lower position, and then the formwork can be moved to the design height by the climbing formwork support. Since the support construction height is low, it is convenient to hoist and install the formwork, which can speed up the construction progress.

[0047] This cable-stayed bridge construction method, based on the climbing formwork method and the cantilever casting method, adopts the cantilever casting method, which facilitates the casting of the main beam at a high altitude, avoids the erection of high construction scaffolds, saves construction costs, and reduces construction difficulty. Attached Figure Description

[0048] Figure 1 The flowchart of the cable-stayed bridge construction method based on climbing formwork and fulcrum hanging basket cantilever method proposed in this invention is as follows:

[0049] Figure 2 This invention proposes a construction method for cable-stayed bridges based on climbing formwork and fulcrum hanging basket cantilever construction, using a construction flowchart of the top formwork in the hanging basket cantilever construction method. Detailed Implementation

[0050] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0051] For examples, please refer to Figure 1-2This invention provides a construction method for cable-stayed bridges based on the climbing formwork method and the cantilever casting method with support points, the specific steps of which include:

[0052] S1: Construction of the main tower foundation;

[0053] S2: Installation and construction of climbing formwork support;

[0054] S3: Top formwork installation;

[0055] S4: The climbing formwork method is used for the construction of the main tower;

[0056] S5: Top formwork pouring construction;

[0057] S6: The main beam is constructed using the hanging basket method;

[0058] Furthermore, in step S1, before constructing the main tower base, the excavation location of the foundation pit needs to be marked out and measured before the base can be poured. It is necessary to ensure the accuracy of the base construction location to avoid errors. When pouring a large base, the skip-pour method should be used. The skip-pour method can avoid cracks in the base and improve the strength of the base. During construction, the concrete needs to be poured using a chute. The chute pouring method can avoid the separation of aggregate and mortar in the concrete and ensure the quality of concrete pouring. After pouring, the concrete needs to be vibrated to remove air bubbles inside the concrete and avoid the formation of holes or honeycombs after the concrete solidifies, thus ensuring the strength of the concrete. After the base is placed for 7-10 days, the bottom of the main tower can be constructed on the base. During construction, the bottom of the main tower is constructed to the preset height using the flip-form construction process. At the preset height, a complete climbing formwork support can be installed at the bottom of the main tower.

[0059] Furthermore, in step S2, before installing the climbing formwork support, it is necessary to ensure that the strength of the concrete at the bottom of the main tower reaches 15-25MPa. When installing the climbing formwork support, the outer protective structure needs to be installed simultaneously, and the height of the outer protective structure must be higher than the working surface. The erection of the outer protective structure can play a safety role. When connecting the climbing formwork support with the through-wall bolt rod, double nuts are required for fixing to prevent the nuts from loosening and improve safety. After the double nuts are pre-tightened, the exposed length of the through-wall bolt rod after passing through the double nuts should not be less than 1cm.

[0060] In this embodiment, during the installation of the top formwork in step S3, the top formwork template needs to be installed on the climbing formwork support so that the top formwork template is located above the formwork of the main tower pouring area. The top formwork needs to be constructed symmetrically with the main tower as the axis. Symmetrical construction can ensure the balance of the main tower and improve the safety during construction.

[0061] The specific steps for top formwork installation include:

[0062] S301: Install a sector bracket on the climbing formwork support. The sector bracket has a triangular structure, which has high stability. After the sector bracket is installed on the climbing formwork support, the climbing formwork support can drive the sector bracket to move upward when climbing, so that the sector bracket is located at the upper end of the climbing formwork support. The sector bracket is symmetrically arranged, which improves stability.

[0063] S302: Install the bottom formwork on the fan-shaped bracket and tie the bottom plate reinforcement;

[0064] S303: Install two side forms symmetrically on the fan-shaped bracket and tie the web reinforcement;

[0065] S304: Install the inner mold above the bottom mold and between the two side molds;

[0066] S305: Tie the top slab reinforcement above the inner formwork and the two side formworks;

[0067] S306: Install end molds at both ends of the bottom mold, inner mold, and two side molds;

[0068] Once the bottom mold, side mold, top mold, and end mold are installed, the top mold casting template is assembled.

[0069] Furthermore, in step S4, when using the climbing formwork method for construction, after the concrete is poured and formed, when the formwork is removed, a wall-attachment device needs to be installed at the pre-embedded position of the hydraulic climbing formwork to ensure that the wall-attachment device is in full contact with the concrete surface and that the fixing sleeve completely covers the load-bearing range of the wall-attachment seat. Before the guide rail is raised, it needs to be inspected and cleaned to ensure that there are no obstacles on the guide rail that would hinder its raising. In addition, before the climbing formwork support is raised, the concrete of the climbing layer also needs to be tested so that the concrete strength reaches 15-25MPa.

[0070] Furthermore, in step S5, after the climbing formwork support climbs to the preset height, when the top formwork is at the preset height, the bottom plate, web plate and top plate can be poured. When the concrete is cured to a structural strength of 15-25MPa, the concrete needs to be prestressed.

[0071] In this embodiment, the specific steps of the hanging basket method construction in step S6 include:

[0072] S601: Install the hanging basket travel track at the top of the main tower. The two hanging basket travel tracks need to be kept parallel and a stable connection between the hanging basket travel track and the top of the main tower needs to be ensured.

[0073] S602: Assemble the hanging basket diamond frame and install it on the hanging basket travel track. The hanging basket diamond frame needs to be moved to the top of the main tower by hoisting equipment. After the two hanging basket diamond frames are placed on the two hanging basket travel tracks, the two hanging basket diamond frames need to be temporarily fixed with a hand chain hoist to ensure the stability of the hanging basket diamond frame. After the hanging basket diamond frame is connected to the hanging basket travel mechanism, the machine casing will remove the hand chain hoist.

[0074] S603: Install crossbeams on the two hanging basket rhomboid frames to form a whole. The crossbeams can connect the two hanging basket rhomboid frames, enabling the two hanging basket rhomboid frames to move synchronously, thus improving stability and safety.

[0075] S604: Install the hanging basket anchoring system to anchor it to the concrete beam segment at the top of the main tower. The anchoring system can ensure the connection between the hanging basket rhomboid frame and the top of the main tower while ensuring the movement of the hanging basket rhomboid frame, thereby improving the stability of the hanging basket rhomboid frame.

[0076] S605: Erects the upper crossbeam, front sling, lower crossbeam and bottom formwork support of the hanging basket, which can complete the installation of the hanging basket and the installation of the bottom formwork support located under the main beam, so that the bottom formwork support forms a working platform.

[0077] S606: Install the hanging basket bottom mold on the bottom mold support;

[0078] S607: Install the sliding beams and side molds of the hanging basket on both sides of the bottom mold support;

[0079] S608: Pre-compress the installed bottom and side molds of the hanging basket. Pre-compression can improve the stability of the bottom and side molds of the hanging basket.

[0080] S609: Install and fix the inner formwork sliding beam of the hanging basket;

[0081] S6010: Tie the bottom slab reinforcement and web reinforcement on the bottom formwork and side formwork of the hanging basket;

[0082] S6011: Install the inner formwork of the hanging basket and tie the steel reinforcement of the top plate of the hanging basket;

[0083] S6012: After the top slab reinforcement is tied, install the hanging basket end formwork at the ends of the bottom formwork, top formwork, and inner formwork of the hanging basket. Concrete can be poured after the hanging basket end formwork is installed.

[0084] S6013: After the concrete reaches the preset strength, that is, when the structural concrete strength is greater than 15MPa, remove the end formwork of the hanging basket and demold the bottom formwork, side formwork and inner formwork of the hanging basket. By controlling the diamond-shaped frame of the hanging basket, the bottom formwork, side formwork and inner formwork of the hanging basket can be separated from the main beam after pouring, which facilitates the demolding operation of the bottom formwork, side formwork and inner formwork of the hanging basket and makes it more convenient.

[0085] S6014: Install the hanging basket travel track on the poured concrete beam segment and remove the anchoring system. This allows the hanging basket travel mechanism to be installed on the newly poured main beam, facilitating the forward movement of the hanging basket rhombus frame. Removing the anchoring system also facilitates the long-distance movement of the hanging basket rhombus frame.

[0086] S6015: Move the hanging basket diamond frame so that it can move the hanging basket bottom formwork, hanging basket side formwork and hanging basket inner formwork. After moving, the hanging basket diamond frame is fixed by the anchoring system. When the hanging basket diamond frame is moved to the hanging basket traveling mechanism on the newly poured main beam, the hanging basket diamond frame can drive the hanging basket bottom formwork, hanging basket side formwork and hanging basket inner formwork to one end of the main beam.

[0087] S6016: Lift the bottom formwork, side formwork, and inner formwork of the hanging basket to move them to the predetermined position for steel reinforcement binding and concrete pouring. The diamond-shaped structure of the hanging basket can lift the bottom formwork, side formwork, and inner formwork, allowing them to reach the predetermined position, which facilitates subsequent steel reinforcement binding.

[0088] Furthermore, in step S6013, after the concrete reaches the preset strength, the beam segment needs to be prestressed and tested before the installation of the hanging basket travel track can be carried out. After the newly poured main beam reaches the preset strength, steel strands need to be inserted inside it and prestressing is completed to improve the strength of the main beam. After the prestressing is completed, the strength of the main beam needs to be tested to ensure the safety of construction. After the main beam passes the test, the hanging basket travel track can be installed on the main beam. In addition, when the main beam is poured in segments, prestressing and strength testing are required after each pour.

[0089] Furthermore, in step S6, when constructing the main beam using the hanging basket method, the main beams on both sides of the tower column need to be constructed simultaneously to ensure the tower column remains balanced, which can improve the safety during construction. In addition, the construction length of the main beam on one side of the tower column needs to be less than half the distance between the two tower columns to ensure the safety of the main beam and avoid the main beam from breaking.

[0090] Furthermore, in step S6, when the main beams on the two tower columns reach the predetermined span, the main beams need to be closed. When closing, the hanging basket diamond structure on one side of the main beam is removed, and the hanging basket diamond structure on one of the main beams can be used. Before pouring concrete, prestressed pipes need to be set at the closure joint, and prestressing is performed first before construction can be carried out at the closure joint. Equal weight counterweights are added on both sides of the closure joint. When pouring concrete, the equal weight counterweights can be disassembled simultaneously.

[0091] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A construction method for a cable-stayed bridge based on the climbing formwork method and the cantilever casting method with supporting formwork, characterized in that, The specific steps include: S1: Construction of the main tower foundation; S2: Installation and construction of climbing formwork support; S3: Top formwork installation; In step S3, when installing the top formwork, the top formwork template needs to be installed on the climbing formwork support so that the top formwork template is located above the formwork of the main tower pouring area, and the top formwork needs to be constructed symmetrically with the main tower as the axis. The specific steps for top formwork installation include: S301: Install fan-shaped brackets on the climbing formwork support, so that the fan-shaped brackets are located at the upper end of the climbing formwork support and the fan-shaped brackets are symmetrically arranged; S302: Install the bottom formwork on the fan-shaped bracket and tie the bottom plate reinforcement; S303: Install two side forms symmetrically on the fan-shaped bracket and tie the web reinforcement; S304: Install the inner mold above the bottom mold and between the two side molds; S305: Tie the top slab reinforcement above the inner formwork and the two side formworks; S306: Install end molds at both ends of the bottom mold, inner mold, and two side molds; S4: The climbing formwork method is used for the construction of the main tower; S5: Top formwork pouring construction; In step S5, after the climbing formwork support climbs to the preset height, so that the top formwork is at the preset height, the bottom plate, web plate and top plate are poured. When the concrete is cured to the point that the structural strength reaches 15-25MPa, the concrete needs to be prestressed. S6: The main beam is constructed using the hanging basket method; In step S6, the specific steps of the hanging basket method construction include: S601: Install the hanging basket traveling track at the top of the main tower; S602: Assemble the diamond-shaped frame of the hanging basket and install it on the hanging basket's travel track; S603: Install crossbeams on the two hanging basket rhomboid frames to make the two hanging basket rhomboid frames form a whole; S604: Install the hanging basket anchoring system to anchor it to the concrete beam segment at the top of the main tower; S605: Erect the upper crossbeam, front sling, lower crossbeam, and bottom formwork support of the hanging basket; S606: Install the hanging basket bottom mold on the bottom mold support; S607: Install the sliding beams and side molds of the hanging basket on both sides of the bottom mold support; S608: Pre-press the installed bottom and side molds of the hanging basket; S609: Install and fix the inner formwork sliding beam of the hanging basket; S6010: Tie the bottom slab reinforcement and web reinforcement on the bottom formwork and side formwork of the hanging basket; S6011: Install the inner formwork of the hanging basket and tie the steel reinforcement of the top plate of the hanging basket; S6012: After the top slab reinforcement is tied, install the hanging basket end formwork at the ends of the bottom formwork, top formwork, and inner formwork of the hanging basket. Concrete is poured immediately after the hanging basket end formwork is installed. S6013: After the concrete reaches the preset strength, remove the end formwork of the hanging basket and demold the bottom formwork, side formwork, and inner formwork of the hanging basket. S6014: Install the hanging basket travel track on the poured concrete beam segment and remove the anchoring system; S6015: Move the rhomboid frame of the hanging basket so that it can move the bottom mold, side mold and inner mold of the hanging basket. After the movement, the rhomboid frame of the hanging basket is fixed by the anchoring system. S6016: Lift the bottom formwork, side formwork, and inner formwork of the hanging basket to move them to the predetermined position, tie the reinforcing steel, and pour concrete. In step S6013, after the concrete reaches the preset strength, the beam segment needs to be prestressed and tensioned, and the beam segment needs to be tested before the installation of the hanging basket traveling track is carried out. When using the hanging basket method to construct the main beam, the main beams on both sides of the tower column need to be constructed simultaneously to ensure that the tower column remains balanced, and the construction length of the main beam on one side of the tower column needs to be less than half the distance between the two tower columns. When the main beams on the two tower columns reach the predetermined span, the main beams need to be closed. During closure, a hanging basket on one of the main beams is used. Before pouring concrete, prestressed ducts need to be installed at the closure joint, and equal weight counterweights are added on both sides of the closure joint. When pouring concrete, the equal weight counterweights are dismantled.

2. The construction method for a cable-stayed bridge based on the climbing formwork method and the cantilever casting method with supporting formwork, as described in claim 1, is characterized in that: In step S1, before constructing the main tower base, it is necessary to lay out and measure the excavation location of the foundation pit before pouring the base. For foundations with a large area, the skip-pour method is required. During construction, the concrete is poured using a chute, and after pouring, the concrete is vibrated to remove air bubbles. After the base has been placed for 7-10 days, the bottom of the main tower is constructed on the base. During construction, the bottom of the main tower is constructed to the preset height using a formwork construction process.

3. The construction method for a cable-stayed bridge based on the climbing formwork method and the cantilever casting method with supporting formwork, as described in claim 1, is characterized in that: In step S2, before installing the climbing formwork support, it is necessary to ensure that the strength of the concrete at the bottom of the main tower reaches 15-25MPa. When installing the climbing formwork support, the outer enclosure needs to be installed simultaneously, and the height of the outer enclosure needs to be higher than the operating surface. When the climbing formwork support is connected to the through-wall bolt rod, double nuts are required for fixing. After the double nuts are pre-tightened, the exposed length of the through-wall bolt rod after passing through the double nuts should not be less than 1cm.

4. The construction method for a cable-stayed bridge based on the climbing formwork method and the cantilever casting method with supporting formwork, as described in claim 1, is characterized in that: In step S4, when using the climbing formwork method for construction, after the concrete is poured and the formwork is removed, a wall-attachment device needs to be installed at the pre-embedded position of the hydraulic climbing formwork to ensure that the wall-attachment device is in full contact with the concrete surface and that the fixing sleeve completely covers the load-bearing range of the wall-attachment seat. Before the guide rail is raised, it needs to be inspected and cleaned to ensure that there are no obstacles on the guide rail that would hinder its raising. In addition, the concrete of the climbing layer also needs to be tested before the climbing formwork support is raised, so that the concrete strength needs to reach 15-25MPa.

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