A cantilever end reverse formwork supporting system and construction method for a large-span cast-in-situ bridge deck

Abstract

This invention discloses a reverse-hanging formwork support system and construction method for the cantilever end of a long-span cast-in-place bridge deck, belonging to the field of bridge construction. It includes: a cantilever support beam, installed on the cast-in-place bridge deck, with one end fixed to the deck and the other end extending outwards to form a cantilever end; a vertical suspension member, connected to the cantilever end of the support beam and extending downwards vertically; and a bottom bearing platform, including a wooden back brace installed at the lower end of the vertical suspension member and a formwork panel installed on the back brace to support the cantilever end of the cast-in-place bridge deck. This reduces the consumption of steel profiles and the cost of special processes, eliminates the need for professional welders and large equipment such as aerial work platforms, and avoids the risk of damage to the main beam caused by the later removal of stiffening plates. Furthermore, this reverse-hanging formwork support system occupies little space under the cast-in-place bridge deck, further mitigating interference with surrounding traffic.

Description

Technical Field

[0001] This invention relates to the field of bridge construction, specifically to a reverse-hanging formwork support system and construction method for the cantilever end of a long-span cast-in-place bridge deck. Background Technology

[0002] In the construction of cantilever ends of long-span cast-in-place bridge decks, the mainstream technology currently adopts the triangular bracket construction method to ensure the stability and load-bearing capacity of the cantilever structure during concrete pouring. The construction process involves multiple steps, including truss factory processing, on-site welding and assembly, weld flaw detection, static load preloading test, scaffold erection, rebar tying, concrete pouring, curing, and subsequent formwork removal, stiffening plate removal, grinding and painting. The triangular bracket construction method can effectively bear the construction live load and the self-weight of the concrete. By embedding steel plates, the load is evenly transferred to the main beam, avoiding local stress concentration. It has been widely used in engineering practice.

[0003] However, the triangular bracket construction method requires a large amount of medium-sized steel in practical applications, and additional costs are required for professional weld flaw detection, static load preloading, and other processes. In terms of labor, it requires paying high wages to highly skilled workers such as professional welders, and in terms of machinery, it requires the rental of aerial work platforms. The overall cost is high. In addition, the processes from the processing of the triangular brackets to the later cutting, grinding, and painting of stiffening plates will prolong the construction period and affect the overall progress of the project. Furthermore, the triangular bracket construction method requires reserving sufficient hoisting and working space under the cast-in-place bridge deck, which will also cause interference to surrounding traffic. Summary of the Invention

[0004] The purpose of this invention is to propose a reverse-hanging formwork support system and construction method for the cantilever end of a long-span cast-in-place bridge deck, aiming to solve the problems of high cost, long cycle, and traffic disruption during construction of the existing triangular bracket construction scheme.

[0005] This invention provides a reverse-hanging formwork support system for the cantilever end of a long-span cast-in-place bridge deck, comprising: A cantilever support beam is installed on the cast-in-place bridge deck. One end of the cantilever support beam is fixed to the cast-in-place bridge deck, and the other end cantilevers out to the outside of the cast-in-place bridge deck to form a cantilever end. A vertical hanging component is connected to the cantilever end of the cantilever support beam and extends downward in the vertical direction; The bottom support platform includes a wooden back brace located at the lower end of the vertical hanging member and a template panel located on the wooden back brace to form a cantilevered end for supporting the cast-in-place bridge deck.

[0006] Preferably, the cantilever end anti-hanging formwork support system of the long-span cast-in-place bridge deck further includes a support member sleeved on the outside of the shear nail on the cast-in-place bridge deck, a top support and a fixing member set on the top of the support member, the cantilever support beam being set on the top support, and the fixing member being wrapped around the outside of the cantilever support beam and fixed at both ends to the cast-in-place bridge deck.

[0007] Preferably, the number of the support members is at least two, and the two support members are distributed along the longitudinal direction of the cantilever support beam.

[0008] Preferably, the number of cantilever support beams is at least two, and the at least two cantilever support beams are arranged in parallel. The cantilever end anti-suspension formwork support system of the large-span cast-in-place bridge deck further includes a suspension part disposed on the cantilever support beam and a bearing part disposed at the lower end of the vertical hanging member. The suspension part is arranged laterally between at least two adjacent cantilever support beams. The upper end of the vertical hanging member is connected to the suspension part. The vertical hanging member extends downward from the suspension part in the vertical direction to connect with the bearing part. The bottom bearing platform is fixed on the bearing part.

[0009] Preferably, the suspension part rests against the upper surface of the cantilever support beam, and the load-bearing part is located on the lower surface of the bottom load-bearing platform.

[0010] Preferably, the vertical hanging member is disposed through the suspension part and the supporting part in a vertical direction, and the upper end of the vertical hanging member extending out of the suspension part and the lower end extending out of the supporting part are respectively provided with locking members, the locking members being butterfly buckles and nuts that are threadedly engaged with the vertical hanging member.

[0011] Preferably, the template panel abuts against the bottom surface of the cast-in-place bridge deck.

[0012] Preferably, the timber back ribs include transverse timber back ribs arranged along the transverse direction of the bridge and longitudinal timber back ribs arranged along the longitudinal direction of the bridge, and the transverse timber back ribs and the longitudinal timber back ribs are arranged in a crisscross pattern.

[0013] Preferably, the template panel is made of bamboo plywood or wood plywood.

[0014] A construction method for a reverse-hanging formwork support system for the cantilever end of a long-span cast-in-place bridge deck includes the following steps: S1: Fit the support members onto the outside of the shear studs on the cast-in-place bridge deck, and adjust the number and position of the support members so that the support members are spaced apart along the transverse direction of the cast-in-place bridge deck. S2: A top support is set on the top of the support member, and the cantilever support beam is placed on the top support, so that one end of the cantilever support beam can be extended to the outside of the cast-in-place bridge deck to form a cantilever end. Then, a fastener is wrapped around the outside of the cantilever support beam, and the two ends of the fastener are fixedly connected to the cast-in-place bridge deck. S3: A suspension part is provided on the cantilever end of the cantilever support beam, a vertical hanging part is installed on the suspension part and extends downward in the vertical direction, a bearing part is provided at the lower end of the vertical hanging part, and the vertical hanging part passes through the suspension part and the bearing part, and a fixing part is installed at the upper end of the vertical hanging part extending out of the suspension part and the lower end extending out of the bearing part respectively. S4: Lay wooden back ribs and formwork panels in sequence on the load-bearing part to form a bottom load-bearing platform for supporting the casting of the cantilever end of the cast-in-place bridge deck; S5: Adjust the fixing part at the lower end of the vertical hanging component so that the template panel abuts against the bottom surface of the cast-in-place bridge panel.

[0015] Compared with existing technologies, it has the following beneficial effects: This invention provides a reverse-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck. One end of a cantilever support beam is fixed to the cast-in-place bridge deck, while the other end cantilevers out to one side of the deck to form a cantilever end. Vertical hangers connect the cantilever end of the support beam to the bottom support platform, suspending the timber back bracing and formwork panels below the cantilever end. This simplifies the traditional triangular bracket method, which requires extensive steel welding, weld inspection, static load preloading, and subsequent cutting, grinding, and painting, into a reverse-suspension formwork support system consisting of a cantilever support beam, vertical hangers, and a bottom support platform. This reduces the amount of steel consumed and the cost of special processes, eliminates the need for professional welders and large equipment such as aerial work platforms, and avoids the risk of damage to the main beam during the later removal of stiffening plates. Furthermore, this reverse-suspension formwork support system occupies little space under the cast-in-place bridge deck, further mitigating interference with surrounding traffic. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only preferred embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the anti-hanging formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the bottom view of the anti-hanging formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to an embodiment of the present invention. Figure 3 This is a flowchart illustrating the construction method of a wet, long-span cast-in-place bridge deck cantilever end inverted formwork support system according to the present invention.

[0018] In the diagram, 1 is the cantilever support beam; 2 is the vertical hanging component; 3 is the bottom bearing platform; 31 is the timber back rib; 32 is the formwork panel; 4 is the support component; 5 is the top support; 6 is the fixing component; 7 is the suspension part; 8 is the bearing part; and 9 is the locking component. Detailed Implementation

[0019] To better understand the structure, functional features, and advantages of the present invention, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings: like Figure 1 , Figure 2 and Figure 3 As shown, the present invention provides a cantilever end anti-suspension formwork support system for a long-span cast-in-place bridge deck, comprising: a cantilever support beam 1, a vertical hanger 2, and a bottom bearing platform 3. The cantilever support beam 1 is disposed on the cast-in-place bridge deck, one end of the cantilever support beam 1 is fixed to the cast-in-place bridge deck, and the other end cantilevers out to the outside of the cast-in-place bridge deck to form a cantilever end. The vertical hanger 2 is connected to the cantilever end of the cantilever support beam 1 and extends downward in the vertical direction. The bottom bearing platform 3 includes a wooden back rib 31 disposed at the lower end of the vertical hanger 2 and a formwork panel 32 disposed on the wooden back rib 31 to form a support for the cantilever end of the cast-in-place bridge deck.

[0020] According to the embodiment of the present invention, the support system is used for the concrete pouring construction of the cantilever end of the long-span cast-in-place bridge deck, replacing the traditional triangular bracket method. The system consists of a cantilever support beam 1, vertical hangers 2, and a bottom bearing platform 3. One end of the cantilever support beam 1 is fixed to the cast-in-place bridge deck, and the other end cantilevers out to the outside of the cast-in-place bridge deck. The structural strength of the cast-in-place bridge deck itself serves as the anchoring foundation for the support system, eliminating the need for other supports below the cast-in-place bridge deck. The vertical hangers 2 extend the load that the cantilever end of the cantilever support beam 1 can bear, extending from the cantilever end of the cantilever support beam 1 to the formwork panel 32 on one side of the cast-in-place bridge deck. The wooden back ribs 31 in the bottom bearing platform 3 provide a supporting skeleton for the formwork panel 32, evenly distributing the concrete load from the formwork panel 32 to the vertical hangers 2.

[0021] When concrete is poured onto the formwork panel 32 on one side of the cast-in-place bridge deck, the self-weight load of the concrete acts directly on the formwork panel 32 and is distributed through the wooden back bracing 31 to the vertical hanging member 2. Then, it is transferred upward through the vertical hanging member 2 to the cantilever support beam 1, and finally to the main structure of the cast-in-place bridge deck through the cantilever support beam 1. The load of the concrete pouring is borne by the main structure of the cast-in-place bridge deck, and there is no need to set up other supports under the bridge deck. After the pouring is completed, the operators can remove the cantilever end support beam, the vertical hanging member 2 and the bottom bearing platform 3 from top to bottom. During the removal process, there is no need for cutting, grinding and other treatments, which reduces the consumption of steel materials and the investment cost of special processes. It does not require professional welders and large equipment such as aerial work platforms, and avoids the risk of damage to the main beam when the stiffening plate is cut off later. In addition, the reverse hanging formwork support system occupies little space under the cast-in-place bridge deck, which further reduces the interference with the surrounding traffic.

[0022] The following detailed description uses specific examples: In some embodiments, the cantilever end inverted formwork support system for long-span cast-in-place bridge decks further includes a support member 4 fitted onto the outside of shear studs on the cast-in-place bridge deck, a top support 5 disposed on the top of the support member 4, and a fixing member 6. The cantilever support beam 1 is disposed on the top support 5, and the fixing member 6 is wrapped around the outside of the cantilever support beam 1 and fixed at both ends to the cast-in-place bridge deck. The number of support members 4 is at least two, and the two support members 4 are distributed along the longitudinal direction of the cantilever support beam 1.

[0023] During installation, operators place at least two support members 4 along the same straight line in the transverse direction onto the outside of the pre-installed shear studs on the cast-in-place bridge deck. The two support members 4 provide multi-point support for the subsequent installation of the cantilever support beam 1, contributing to its stability. The shear studs are anchoring components embedded in the cast-in-place bridge deck, facilitating positioning of the support members 4. Then, top supports 5 are placed on top of each support member 4, and the height of each top support 5 is adjusted to ensure that the upper surfaces of each top support 5 are at the same height. Finally, the cantilever support beam 1 is placed on top supports 5. The cantilever support beam 1 is made of I-beam with high strength and good bending resistance to ensure that the cantilever support beam 1 will not deform excessively when bearing load. The fixing member 6 (reinforcing bar) is wrapped around the outside of the cantilever support beam 1 and the two ends of the fixing member 6 are fixedly connected to the cast-in-place bridge deck. After the fixing member 6 is wrapped around the cantilever support beam 1, it is tightened to apply downward pressure to the cantilever support beam 1 and firmly press the cantilever support beam 1 onto the top support 5, restricting the displacement of the cantilever support beam 1 in the horizontal and vertical directions, and ensuring that the cantilever support beam 1 will not loosen or shift due to vibration or eccentric load during the concrete pouring process.

[0024] In some embodiments, the number of cantilever support beams 1 is at least two, and the at least two cantilever support beams 1 are arranged in parallel. The anti-suspension formwork support system for the cantilever end of the long-span cast-in-place bridge deck also includes a suspension part 7 disposed on the cantilever support beam 1 and a bearing part 8 disposed at the lower end of the vertical hanger 2. The suspension part 7 is arranged laterally between at least two adjacent cantilever support beams 1. The upper end of the vertical hanger 2 is connected to the suspension part 7, and the vertical hanger 2 extends downward from the suspension part 7 in a vertical direction to connect with the bearing part 8. The bottom bearing platform 3 is fixed on the bearing part 8. The suspension part 7 abuts against the upper surface of the cantilever support beam 1, and the bearing part 8 is located on the lower surface of the bottom bearing platform 3. The vertical hanger 2 is disposed vertically through the suspension part 7 and the bearing part 8. The upper end of the vertical hanger 2 extending out of the suspension part 7 and the lower end extending out of the bearing part 8 are respectively provided with locking parts 9. The locking parts 9 are butterfly buckles (not shown) and nuts (not shown) that are threadedly engaged with the vertical hanger 2.

[0025] During assembly, the operator first fixes the suspension part 7 to the cantilever support beam 1. The suspension part 7 is fixed to the cantilever support beam 1 by welding. Both the suspension part 7 and the bearing part 8 have through holes for the vertical hanging component 2 to pass through, providing vertical guidance and support for the vertical hanging component 2. The vertical hanging component 2 (steel bar or bolt) is then passed vertically through the suspension part 7 and the bearing part 8. The upper end of the vertical hanging component 2 extends upward beyond the upper surface of the suspension part 7, and the lower end of the vertical hanging component 2 extends downward beyond the lower surface of the bearing part 8. A butterfly buckle is screwed into the lower end of the vertical hanging component 2. The nut is used to fix the bearing part 8 to a predetermined height position on the vertical hanging part 2. Then, the butterfly buckle and nut are screwed into the upper end of the vertical hanging part 2 to lock the vertical hanging part 2 and the suspension part 7. By locking the upper and lower ends of the vertical hanging part 2, the vertical hanging part 2 is constrained between the suspension part 7 and the bearing part 8 to form a hanging system. When the bottom bearing platform 3 bears the concrete load, the load is transferred through the bearing part 8 to the locking part 9 at the lower end of the vertical hanging part 2, then through the vertical hanging part 2 to the locking part 9 at the upper end of the vertical hanging part 2, and finally through the suspension part 7 to the crossbeam.

[0026] In some embodiments, the formwork panel 32 abuts against the bottom surface of the cast-in-place bridge deck. The timber backing ribs 31 include transverse timber backing ribs 31 arranged along the transverse direction of the bridge and longitudinal timber backing ribs 31 arranged along the longitudinal direction of the bridge, with the transverse and longitudinal timber backing ribs 31 arranged alternately. The formwork panel 32 is made of bamboo plywood or wood plywood.

[0027] Before pouring, the extension length of the vertical hanger 2 and the position of the locking piece 9 are adjusted to ensure that the upper surface of the formwork panel 32 is flush with the bottom surface of the cast-in-place bridge deck, forming a tight contact. When concrete is poured onto the formwork panel 32, a closed joint is formed at the contact point between the formwork panel 32 and the bottom surface of the cast-in-place bridge deck, preventing concrete slurry from leaking out from the gap between the cast-in-place bridge deck and the formwork panel 32, thus ensuring the integrity between the cantilever end of the cast-in-place bridge deck to be poured and the already poured cast-in-place bridge deck. The transverse bridge timber back rib 31 is connected to the bearing part 8 of the vertical hanger 2, distributing the concentrated load along the transverse bridge direction. The longitudinal bridge timber back rib 31 is laid on the transverse bridge timber back rib 31, further distributing the load evenly to the formwork panel 32. The crisscrossing arrangement ensures that the load is evenly distributed in both directions, avoiding excessive local load that could cause deformation of the formwork panel 32. Bamboo plywood is characterized by high strength, high rigidity, smooth surface, and good water resistance, making it suitable for cantilever construction where flatness is a high requirement. Wood plywood is lightweight, easy to process, and low in cost, making it suitable for general pouring operations. Both materials have good workability.

[0028] A construction method for a cantilever end inverted formwork support system for a long-span cast-in-place bridge deck includes the following steps: Support members 4 are fitted onto the outside of shear studs on the cast-in-place bridge deck; the number and position of support members 4 are adjusted so that they are spaced apart along the transverse direction of the cast-in-place bridge deck; a top support 5 is installed on the top of the support members 4; a cantilever support beam 1 is placed on the top support 5, so that one end of the cantilever support beam 1 extends outward to the outside of the cast-in-place bridge deck to form a cantilever end; then, a fixing member 6 is wrapped around the outside of the cantilever support beam 1, and both ends of the fixing member 6 are fixedly connected to the cast-in-place bridge deck; at the cantilever end of the cantilever support beam 1... A suspension part 7 is provided on the top, and a vertical hanger 2 is installed on the suspension part 7 and extended downward in the vertical direction. A bearing part 8 is provided at the lower end of the vertical hanger 2, and the vertical hanger 2 passes through the suspension part 7 and the bearing part 8. Fixing members 6 are installed at the upper end of the vertical hanger 2 extending out of the suspension part 7 and the lower end extending out of the bearing part 8, respectively. Wooden back ribs 31 and template panels 32 are laid on the bearing part 8 in sequence to form a bottom bearing platform 3 for supporting the casting of the cantilever end of the cast-in-place bridge deck. The fixing members 6 at the lower end of the vertical hanger 2 are adjusted so that the template panel 32 abuts against the bottom surface of the cast-in-place bridge deck.

[0029] The operators first fitted the support member 4 onto the outside of the shear studs pre-embedded in the cast-in-place bridge deck. Based on the stress requirements of the cantilever end and the span of the cantilever support beam 1, the number and position of the support members 4 were adjusted to ensure even spacing along the transverse direction of the cast-in-place bridge deck. This ensured uniform stress distribution on the subsequent cantilever support beam 1 and prevented bending deformation due to excessive support spacing. A top support 5 was installed on top of each support member 4, ensuring the upper surfaces of all top supports 5 were at the same horizontal level. The cantilever support beam 1 was then placed on the top support 5, and its position was adjusted so that one end could extend beyond the outside of the cast-in-place bridge deck, forming the required cantilever length. At the end, a fixing member 6 is wrapped around the outside of the cantilever support beam 1, and the two ends of the fixing member 6 are fixedly connected to the cast-in-place bridge deck to firmly press the cantilever support beam 1 onto the top support 5, restricting the lateral displacement and vertical movement of the cantilever support beam 1. A suspension part 7 is fixedly installed on the cantilever end of the cantilever support beam 1, and a vertical hanging member 2 is installed on the suspension part 7 and extends downward in the vertical direction. A bearing part 8 is set at the lower end of the vertical hanging member 2. After the vertical hanging member 2 is installed in place, locking members 9 are installed on the part of it extending out of the upper end of the suspension part 7 and the part extending out of the lower end of the bearing part 8, respectively, to lock the relative position between the vertical hanging member 2 and the suspension part 7 and the bearing part 8.

[0030] On the load-bearing part 8, crisscrossing transverse bridge-direction timber back ribs 31 and longitudinal bridge-direction timber back ribs 31 are laid in sequence to form a grid-like load-bearing skeleton and template panels 32 located on the transverse bridge-direction timber back ribs 31 and longitudinal bridge-direction timber back ribs 31. The template panels 32 serve as the working surface for concrete pouring. By adjusting the position of the locking piece 9 at the lower end of the vertical hanger 2, the position of the load-bearing part 8 on the vertical hanger 2 is changed, and the height position of the template panels 32 in the vertical direction is adjusted so that the upper surface of the template panels 32 is in close contact with the bottom surface of the cast-in-place bridge deck, ensuring that there are no gaps between them and preventing concrete slurry from leaking out during pouring.

[0031] During the pouring process, the concrete load is transferred to the back beam of the timber frame 31 through the formwork panel 32, and then to the crossbeam through the bearing part 8, the vertical hanging part 2, and the suspension part 7. Finally, it is transferred to the main structure of the cast-in-place bridge deck through the support part 4 and the fixing part 6. All loads are borne by the cast-in-place bridge deck that has been poured, and there is no need to set up other supports under the cast-in-place bridge deck. This provides a reliable method to ensure the safe and efficient construction of the cantilever end of the large-span cast-in-place bridge deck.

[0032] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any way. Any person skilled in the art can make many possible variations and modifications to the technical solutions of the present invention, or modify them into equivalent embodiments, without departing from the scope of the present invention. Therefore, any modifications, equivalent changes, and alterations made to the above embodiments based on the technology of the present invention without departing from the scope of the present invention are within the protection scope of the present invention.

Claims

1. A reverse-hanging formwork support system for the cantilever end of a long-span cast-in-place bridge deck, characterized in that, include: A cantilever support beam (1) is installed on the cast-in-place bridge deck. One end of the cantilever support beam (1) is fixed to the cast-in-place bridge deck, and the other end extends outward to the outside of the cast-in-place bridge deck to form a cantilever end. A vertical hanging member (2) is connected to the cantilever end of the cantilever support beam (1) and extends downward in the vertical direction; The bottom support platform (3) includes a wooden back rib (31) set at the lower end of the vertical hanging member (2) and a template panel (32) set on the wooden back rib (31) to form a cantilever end for supporting the cast-in-place bridge deck.

2. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 1, characterized in that, The cantilever end inverted formwork support system of the large-span cast-in-place bridge deck also includes a support member (4) sleeved on the outside of the shear nail on the cast-in-place bridge deck, a top support (5) set on the top of the support member (4) and a fixing member (6). The cantilever support beam (1) is set on the top support (5), and the fixing member (6) is wrapped around the outside of the cantilever support beam (1) and fixed at both ends to the cast-in-place bridge deck.

3. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 2, characterized in that, The number of the support members (4) is at least two, and the two support members (4) are distributed along the longitudinal direction of the cantilever support beam (1).

4. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 2, characterized in that, The number of cantilever support beams (1) is at least two, and at least two cantilever support beams (1) are arranged in parallel. The cantilever end anti-hanging formwork support system of the large-span cast-in-place bridge deck also includes a suspension part (7) arranged on the cantilever support beam (1) and a bearing part (8) arranged at the lower end of the vertical hanging member (2). The suspension part (7) is arranged laterally between at least two adjacent cantilever support beams (1). The upper end of the vertical hanging member (2) is connected to the suspension part (7). The vertical hanging member (2) extends downward from the suspension part (7) in the vertical direction to connect with the bearing part (8). The bottom bearing platform (3) is fixed on the bearing part (8).

5. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 4, characterized in that, The suspension part (7) rests against the upper surface of the cantilever support beam (1), and the bearing part (8) is located on the lower surface of the bottom bearing platform (3).

6. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 4, characterized in that, The vertical hanging member (2) is vertically disposed on the suspension part (7) and the bearing part (8). The upper end of the vertical hanging member (2) extending out of the suspension part (7) and the lower end extending out of the bearing part (8) are respectively provided with locking members (9). The locking members (9) are butterfly buckles and nuts that are threadedly engaged with the vertical hanging member (2).

7. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 1, characterized in that, The template panel (32) abuts against the bottom surface of the cast-in-place bridge deck.

8. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 1, characterized in that, The timber back ribs (31) include transverse timber back ribs (31) arranged along the transverse direction of the bridge and longitudinal timber back ribs (31) arranged along the longitudinal direction of the bridge. The transverse timber back ribs (31) and the longitudinal timber back ribs (31) are arranged in a crisscross pattern.

9. The anti-suspension formwork support system for the cantilever end of a long-span cast-in-place bridge deck according to claim 1, characterized in that, The template panel (32) is made of bamboo plywood or wood plywood.

10. A construction method for a reverse-hanging formwork support system for the cantilever end of a long-span cast-in-place bridge deck, characterized in that, Construction using the inverted formwork support system for the cantilever end of a large-span cast-in-place bridge deck as described in any one of claims 1 to 9 includes the following steps: S1: Fit the support members onto the outside of the shear studs on the cast-in-place bridge deck, and adjust the number and position of the support members so that the support members are spaced apart along the transverse direction of the cast-in-place bridge deck. S2: A top support is set on the top of the support member, and the cantilever support beam is placed on the top support, so that one end of the cantilever support beam can be extended to the outside of the cast-in-place bridge deck to form a cantilever end. Then, a fastener is wrapped around the outside of the cantilever support beam, and the two ends of the fastener are fixedly connected to the cast-in-place bridge deck. S3: A suspension part is provided on the cantilever end of the cantilever support beam, a vertical hanging part is installed on the suspension part and extends downward in the vertical direction, a bearing part is provided at the lower end of the vertical hanging part, and the vertical hanging part passes through the suspension part and the bearing part, and a fixing part is installed at the upper end of the vertical hanging part extending out of the suspension part and the lower end extending out of the bearing part respectively. S4: Lay wooden back ribs and formwork panels in sequence on the load-bearing part to form a bottom load-bearing platform for supporting the casting of the cantilever end of the cast-in-place bridge deck; S5: Adjust the fixing part at the lower end of the vertical hanging component so that the template panel abuts against the bottom surface of the cast-in-place bridge panel.

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