Bridge wet joint flying die template and construction method thereof

Abstract

According to the bridge wet joint flying die formwork and the construction method thereof, the bridge wet joint flying die formwork comprises a wet joint formwork body and a traction rope, the traction rope is transversely arranged along a bridge and surrounds an erected adjacent beam plate by a circle, and an annular piece is fixedly connected to the traction rope; two lifting ropes are arranged on the upper surface of the wet joint template body, and at least one buckle is arranged on the lower surface of the wet joint template body; the size of the annular piece is larger than that of the opening of the buckle, so that when the annular piece moves to the position of the buckle along with the traction rope, the annular piece cannot pass through the buckle, and therefore the wet joint formwork body can be dragged to move. The formwork is ingenious in structural design, the construction method is simple, convenient and efficient, an operator can complete installation and removal of the wet joint formwork on a bridge floor, under-bridge matching is not needed, and the formwork is particularly suitable for high-pier, river-crossing and under-bridge complex-terrain bridge engineering.

Description

Technical Field

[0001] The invention relates to the technical field of bridge engineering construction, and in particular to a bridge wet joint flying formwork template and a construction method thereof. Background Art

[0002] Prefabricated prefabricated beam bridges have been widely used in highway bridge construction due to their advantages of fast construction and easy quality control. After the prefabricated beams are erected, adjacent beam sections are connected with cast-in-place concrete wet joints to form a continuous, integrated bridge deck. Wet joint construction typically utilizes the hanging formwork method: a bottom formwork is installed beneath the wet joint, and the wet joint formwork is secured to the beam slabs on either side using tension bolts. In traditional construction, the installation and removal of the wet joint formwork often requires the use of equipment such as a winch to lift or lower the wet joint formwork from beneath the bridge, requiring the presence of workers underneath. However, for high-pier bridges, river-crossing bridges, and bridges with complex terrain beneath them (such as deep valleys or busy roads), this traditional hanging formwork construction method has significant drawbacks: limited working space beneath the bridge makes it difficult for personnel and equipment to reach, resulting in low construction efficiency and safety hazards associated with hoisting the wet joint formwork from high altitudes. Summary of the Invention

[0003] The purpose of the present invention is to provide a bridge wet joint flying formwork and a construction method thereof in view of the deficiencies in the prior art.

[0004] The specific technical solutions are as follows: A wet joint flying formwork for a bridge comprises a wet joint formwork body and a traction rope, wherein the traction rope is arranged transversely along the bridge and surrounds adjacent beams and slabs that have been erected, and a ring member is fixedly connected to the traction rope; two suspension ropes are provided on the upper surface of the wet joint formwork body, and at least one buckle is provided on the lower surface of the wet joint formwork body; the size of the ring member is larger than the opening size of the buckle, so that when the ring member moves to the buckle position with the traction rope, it cannot pass through the buckle, thereby dragging the wet joint formwork body to move.

[0005] Optionally, at least two tie rod holes are provided on the wet joint formwork body, and nuts are fixedly provided at the tie rod holes for connecting tension bolts to fix the wet joint formwork body.

[0006] Optionally, the two hanging ropes are respectively connected to two hanging rope holes on the upper surface of the wet joint template body, and the hanging rope holes are fixedly provided with hanging rings or hanging ears to connect the hanging ropes.

[0007] Optionally, the positions of the two hanging rope holes on the wet joint formwork body are asymmetric with respect to a midline of the length direction of the wet joint formwork body, so that the wet joint formwork body has a predetermined tilt angle when suspended.

[0008] Optionally, the wet seam template body on one side where the buckle is located is in a lower position when suspended, so that this side contacts the traction rope first when the wet seam template body is lowered.

[0009] Optionally, the buckle includes a U-shaped card and an L-shaped self-locking part. A bolt hole is opened on one side of the U-shaped card, and the U-shaped card is fixedly connected to the lower surface of the wet joint template body by bolts; the L-shaped self-locking part is hinged to the U-shaped card and can rotate freely around the hinge axis.

[0010] Optionally, the weight of the long side of the L-shaped self-locking part is less than the weight of the short side of the L-shaped self-locking part, so that in a naturally drooping state, the long side of the L-shaped self-locking part is tilted upward and rests on the bolt of the U-shaped card due to its smaller weight, and the short side of the L-shaped self-locking part droops to close the opening of the U-shaped card.

[0011] Optionally, the traction rope may be one or more flexible ropes arranged in parallel.

[0012] Optionally, the traction rope is a nylon rope or a steel wire rope.

[0013] A construction method using the above-mentioned bridge wet joint flying formwork comprises the following steps: Step 1: Traction rope layout: Before the precast beams and slabs are erected, the traction ropes are pre-placed at appropriate locations on the box beams or pier tops. After all the precast beams and slabs of the same span are erected, the traction ropes are tightened along the transverse direction of the bridge, passing around the bottoms of adjacent beams and slabs and clinging to the sides of the beams and slabs. Then, a ring is attached to the traction ropes and both ends of the traction ropes are fixed, so that the traction ropes are tensioned below the bridge deck. Step 2: Installing the wet joint formwork body: On the bridge deck, use a winch or manually lower the wet joint formwork body from the gap of the wet joint to the designed position of the wet joint bottom using the two lifting ropes; adjust the inclination angle and position of the wet joint formwork body so that the wet joint formwork body fits tightly against the bottom of the beams and slabs on both sides; then insert the tension bolts through the tie rod holes and nuts on the wet joint formwork body to fix the wet joint formwork body to the bottom of the wet joint, completing the installation of the wet joint formwork body; Step 3: Wet joint construction: Tie the steel bars at the wet joints according to the design requirements and set up the side formwork at the top of the wet joints; after inspection and acceptance, pour the wet joint concrete and cure it to the design strength; Step 4: Removal of the wet joint formwork body: After the wet joint concrete reaches the demoulding strength, remove the tension bolts and the top side formwork; slowly lower the wet joint formwork body on the bridge deck through the two suspension ropes, so that it gradually separates from the concrete at the bottom of the wet joint; when the wet joint formwork body is lowered to the point where the buckle on its lower surface contacts the traction rope, the wet joint formwork body will continue to slide down along the traction rope due to the obstruction of the traction rope. At this time, the short side of the L-shaped self-locking part of the buckle first contacts the traction rope and is pushed open, and the traction rope slides into the inside of the U-shaped card; then the L-shaped self-locking part automatically resets under the action of its own weight, locking the traction rope in the U-shaped card, so that the wet joint formwork body is suspended on the traction rope; continue to slowly lower the wet joint formwork body until its weight is completely borne by the traction rope; Step 5: On the bridge deck, one end of the traction rope is pulled manually or by a winch, so that the traction rope drives the wet joint formwork body to move longitudinally along the bridge; when the ring on the traction rope moves with the rope to the buckle position of the wet joint formwork body, the ring is stuck in the buckle because the size of the ring is larger than the buckle opening. At this time, the traction rope is continued to be pulled to drag the wet joint formwork body toward the bridge deck until the wet joint formwork body is dragged onto the bridge deck, completing the removal and recovery of the wet joint formwork body; Step 6. Repeat the construction: According to the above steps 4 to 5, remove all wet joints and wet joint formwork bodies in the same span in turn; if there are multiple traction ropes, multiple traction ropes can be used to remove multiple wet joint formwork bodies in parallel to improve construction efficiency; after the removal is completed, the traction ropes and rings can be recovered and used for wet joint construction in the next span or the next construction section.

[0014] Compared with the prior art, the present invention has the following beneficial effects: High construction efficiency: The installation and removal of the wet joint formwork can be completed on the bridge deck. There is no need for large-scale lifting equipment to repeatedly raise and lower the wet joint formwork, nor is there a need for workers to go under the bridge to cooperate with the operation. This greatly reduces the number of processes and manpower input, and speeds up the construction progress. Good safety performance: It avoids the risk of the wet joint formwork body falling during the vertical hoisting process at high altitude, reduces the construction workers' working time in dangerous environments at high altitude and under bridges, and improves construction safety. The wet joint formwork body is recovered horizontally by dragging the traction rope, and the operation process is smooth and controllable; No site restrictions: Construction is not affected regardless of the height of the piers, whether there is water under the bridge, or whether there is heavy traffic. The traction rope can be flexibly arranged, and the wet joint formwork body is retracted by sliding the traction rope, solving the problem that traditional methods are difficult to operate in complex terrain conditions. Simple and economical structure: The wet joint formwork body and traction device have simple structures. The main materials are conventional steel plates, bolts and ropes. They can be made of construction site scraps to avoid material waste. The device can be used multiple times, reducing construction costs. Easy and flexible operation: The lowering angle of the wet joint formwork body is controlled by two lifting ropes of different colors, which is convenient for operators to identify and adjust; the buckle has an automatic locking function to ensure that the wet joint formwork body will not fall off during the hanging and traction process; multiple traction ropes can be used in parallel, which improves the dismantling efficiency and the traction ropes falling on the bridge deck will not affect the passage of subsequent beam transport vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural schematic diagram of the bridge wet joint flying formwork template in the installation state according to the present invention; Figure 2 This is a schematic structural diagram of the traction rope and the ring member of the present invention; Figure 3 This is a schematic structural diagram of the wet joint template body of the present invention; Figure 4 This is a schematic diagram of the top view of the buckle in the closed state of the present invention; Figure 5 This is a schematic diagram of the overall structure of the buckle in the closed state of the present invention; Figure 6 This is a structural schematic diagram of the bridge wet joint flying formwork template in the released state according to the present invention; Figure 7 This is a schematic diagram of the structure of the buckle of the present invention when it is about to contact the traction rope; Figure 8 This is a structural schematic diagram of the traction rope of the present invention when it is about to enter the U-shaped clamping state; Figure 9 This is a structural diagram of the traction rope of the present invention when it is fully in the U-shaped clamping state. Figure 10 This is a schematic diagram of the state of the template described in the present invention when it is dragged back to the bridge deck through a traction rope.

[0016] In the figure: 10, box girder; 20, traction rope; 201, ring member; 30, wet joint formwork body; 301, first pull rod hole; 302, second pull rod hole; 303, first lifting rope hole; 304, second lifting rope hole; 40, buckle; 401, U-shaped clip; 402, first bolt hole; 403, second bolt hole; 404, L-shaped self-locking member; 501, first lifting rope; 502, second lifting rope; 60, wet joint. DETAILED DESCRIPTION

[0017] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0018] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, but they are not intended to limit the present invention.

[0020] The present invention provides a bridge wet joint flying formwork template, referring to Figure 1-Figure 2 , including a wet joint formwork body 30 and a traction rope 20. The traction rope 20 is arranged horizontally along the bridge and surrounds the adjacent beams and slabs that have been erected. A ring member 201 is fixedly connected to the traction rope 20; two suspension ropes are provided on the upper surface of the wet joint formwork body 30, and at least one buckle 40 is provided on the lower surface of the wet joint formwork body 30; the size of the ring member 201 is larger than the opening size of the buckle 40, so that when the ring member 201 moves to the position of the buckle 40 with the traction rope 20, it cannot pass through the buckle 40, thereby dragging the wet joint formwork body 30 to move.

[0021] In this embodiment, the traction rope 20 is made of high-strength nylon rope. Before the precast beams and slabs are erected, the traction rope 20 is pre-placed on the box beam 10. When all the precast beams and slabs of the same span are erected in place, the traction rope 20 is tightened along the transverse direction of the bridge, so that it passes around the bottom of the adjacent beams and slabs and clings to the side of the beams and slabs, forming a closed loop around the beams and slabs. Then, a ring 201 is tied to the traction rope 20 (which can be a rope ring formed by tying a knot on the traction rope 20 or a separately fixed metal ring), and the two ends of the traction rope 20 are fixed, so that the traction rope 20 is stretched taut below the bridge deck. Figure 3 The wet joint formwork body 30 is a steel plate formwork whose shape matches the bottom of the wet joint 60. Two tie rod holes (first tie rod hole 301 and second tie rod hole 302) are provided on the upper surface of the wet joint formwork body 30, with nuts welded to the corresponding positions. When the wet joint formwork body 30 is installed, the wet joint formwork body 30 can be fixed to the bottom of the wet joint 60 between the beams and slabs on both sides by means of tension bolts and nuts passing through the tie rod holes. The upper surface of the wet joint formwork body 30 also has two hanging rope holes (first hanging rope hole 303 and second hanging rope hole 304), each of which is welded with a lifting ring (not shown in the figure) to connect two hanging ropes (first hanging rope 501 and second hanging rope 502, respectively, and the first hanging rope 501 and the second hanging rope 502 are distinguished by different colors). In this embodiment, the positions of the first hanging rope hole 303 and the second hanging rope hole 304 are intentionally deviated from the center line of the length direction of the wet joint template body 30, so that when the wet joint template body 30 is hung by two hanging ropes, the wet joint template body 30 will tilt to one side, specifically the side where the buckle 40 is provided will tilt slightly downward.

[0022] The traction rope 20 can be one or more traction ropes arranged in parallel. When multiple traction ropes 20 are set, a corresponding ring part 201 is fixed on each traction rope 20, and the same number of buckles 40 are correspondingly arranged on the lower surface of the wet joint template body 30 to improve the traction force balance and efficiency when the wet joint template body 30 is removed.

[0023] Reference Figure 4 and Figure 5 The clip 40 includes a U-shaped clip 401 and an L-shaped self-locking part 404. The U-shaped clip 401 is formed by bending a steel plate, and a first bolt hole 402 and a second bolt hole 403 are formed on one side of the flange. The U-shaped clip 401 is fixed to the lower surface of the wet joint formwork body 30 by bolts. The L-shaped self-locking part 404 can be made by bending steel bars or steel plates. Its corners are hinged to the open end of the U-shaped clip 401 by pins and can rotate freely around the pins. The length and thickness of the long side and short side of the L-shaped self-locking part 404 are different (or weight-reducing holes are drilled in the long side to make it slightly lighter than the short side). In this way, in its natural state, the L-shaped self-locking part 404 will automatically droop due to its own weight, with the short side downward and the long side upward resting on a bolt of the U-shaped clip 401, thereby closing the opening of the U-shaped clip 401. When an external force pushes the short side of the L-shaped self-locking member 404 from below, the self-locking member rotates around the pin, with the long side downward and the short side lifted upward, opening the U-shaped clip 401. After the external force is removed, due to the lighter weight of the long side, the self-locking member returns to its original position under the action of gravity, reclosing the opening. Therefore, when the traction rope 20 pushes the short side of the L-shaped self-locking member 404 upward, the self-locking member rotates around the hinge axis, opening the U-shaped clip 401 and allowing the traction rope 20 to slide into the interior of the U-shaped clip 401. After the traction rope 20 slides in, the L-shaped self-locking member 404 automatically returns to its original position under the action of its own weight, reclosing the opening of the U-shaped clip 401 and locking the traction rope 20 in the U-shaped clip 401.

[0024] The method for constructing bridge wet joints using the above-mentioned flying formwork wet joint formwork body has the following specific steps: Step 1: Laying out the traction rope 20: Before erecting the prefabricated T-beam or box beam 10, place the prepared traction rope 20 on the pier box beam 10, below the beam slab to be erected; after all prefabricated beam slabs in the same span have been erected and temporarily supported and stabilized, pass the traction rope 20 transversely through the gaps in the wet joints 60 between the beam slabs, go down around the bottom of the beam slabs, and then pull it back to the bridge deck, so that the traction rope 20 forms a loop around the beam slabs; adjust the tightness of the traction rope 20 so that it is neither too loose to drag on the ground nor too tight to be subjected to excessive force, then select an appropriate position on the traction rope 20 to tie the ring 201, and fix both ends of the traction rope 20 to the temporary ground anchors or beam slab embedded lifting rings on the bridge deck to ensure that the traction rope 20 is tightened and fixed (such as Figure 1 shown); Step 2: Install the wet joint formwork body 30: Use a small winch (or manual labor) to lift the wet joint formwork body 30 on the bridge deck with two lifting ropes, and slowly lower it to the gap of the wet joint 60; during the lowering process, control the length of the two lifting ropes to keep the wet joint formwork body 30 at a predetermined tilt angle (in this embodiment, the side where the buckle 40 is located is slightly lower). When the wet joint formwork body 30 is lowered to the bottom of the wet joint 60, adjust the position of the wet joint formwork body 30 so that its center line is aligned with the center line of the wet joint 60. Align and make the wet joint formwork body 30 fit tightly against the bottom of the beams and slabs 1 on both sides; then, the bridge deck workers insert the tension bolts, pass the lower ends of the bolts through the tie rod holes on the wet joint formwork body 30 and screw in the nuts to preliminarily fix the wet joint formwork body 30; install another tension bolt in the same way and tighten the nuts to firmly fix the wet joint formwork body 30 to the bottom of the wet joint 60; check the elevation and flatness of the wet joint formwork body 30, and after confirming that they are correct, remove the hanging ropes to complete the installation of the wet joint formwork body 30; Step 3, wet joint 60 construction: After the installation of the wet joint formwork body 30 of the wet joint 60 is completed, the reinforcement binding work of the wet joint 60 is carried out; the reserved connecting steel bars on the side of the prefabricated beam and slab flange plate are tied or welded, usually including the connecting steel bars running through the longitudinal direction of the bridge and the transverse stirrup rings. In order to enhance the bonding between the new and old concrete, the contact surface of the beam and slab should be roughened and cleaned in advance; after the reinforcement binding is completed and passed the inspection, the side wet joint formwork body 30 (usually wooden wet joint formwork can be used) on the top of the wet joint 60 is supported. The main body 30 or the standard steel wet joint formwork body 30 should be placed close to the top surface of the beam and slab flange and fixed to prevent slurry overflow during concrete pouring. After all preparations are completed, pour the wet joint 60 concrete. The concrete should be slightly expansive concrete with the same strength grade as the beam and slab or slightly higher to compensate for shrinkage and improve joint quality. During the pouring process, the concrete should be vibrated and compacted, and special attention should be paid to filling the corners of the wet joint formwork body 30 with concrete. After the wet joint 60 concrete is poured, it should be covered and maintained in a timely manner to keep it moist until it reaches 100% of the design strength. Step 4: Dismantling the wet joint formwork body 30: When the concrete strength of the wet joint 60 reaches the requirement, the wet joint formwork body 30 can be dismantled. First, remove the tension bolts and nuts on the bridge deck to release the fixing constraints of the wet joint formwork body 30; then, reconnect the two lifting ropes to the lifting rope holes of the wet joint formwork body 30, and slowly tighten the lifting ropes to separate the wet joint formwork body 30 from the concrete surface and bear its weight; after confirming that the wet joint formwork body 30 is completely separated from the concrete, the bridge deck operator will simultaneously and slowly loosen the two lifting ropes (such as Figure 6 As shown), slowly lower the wet joint template body 30, and keep its tilted posture during the lowering process so that the side where the buckle 40 is located is always facing downwards. As the wet joint template body 30 continues to descend (as shown Figure 7As shown), the buckle 40 on its lower surface will eventually contact the tensioned traction rope 20 below (as shown Figure 8 As shown in FIG, at this time, due to the obstruction of the traction rope 20, the wet joint template body 30 cannot continue to fall vertically, and will continue to slide down along the direction of the traction rope 20; during the sliding process of the wet joint template body 30, the traction rope 20 will push the short side of the L-shaped self-locking part 404 of the buckle 40, forcing the self-locking part to rotate around the pin to open the opening of the U-shaped card 401, and the traction rope 20 will slide into the interior of the U-shaped card 401 (as shown in FIG. Figure 9 As shown); When the traction rope 20 completely enters the U-shaped card 401, the operator stops lowering the wet joint formwork body 30, and the L-shaped self-locking member 404 automatically resets under its own gravity, and its long side is re-placed on the bolt, locking the traction rope 20 in the U-shaped card 401, so that the wet joint formwork body 30 is suspended on the traction rope 20 (as shown); Figure 10 As shown), at this time, the weight of the wet joint formwork body 30 is borne by the traction rope 20, and the sling rope can be appropriately loosened but kept connected to control the wet joint formwork body 30 to prevent it from shaking violently; Step 5: Recover the wet joint formwork body 30: After the wet joint formwork body 30 is hung on the traction rope 20, the wet joint formwork body 30 can be recovered; two operators are arranged on the bridge deck, one holds one end of the traction rope 20, and the other cooperates to loosen the other end, and slowly pulls the traction rope 20 to move it along the longitudinal direction of the bridge; as the traction rope 20 is pulled, the wet joint formwork body 30 will slide along the direction of the traction rope 20; when the ring part 201 on the traction rope 20 moves with the rope to the position of the buckle 40 of the wet joint formwork body 30, since the size of the ring part 201 is larger than the buckle The opening width of the 40U-shaped card 401 is such that the ring 201 is stuck by the buckle 40 and cannot pass through. At this time, the traction rope 20 is continued to be pulled, and the wet joint formwork body 30 will move in the pulling direction together with the traction rope 20. The operator continues to pull until the wet joint formwork body 30 is dragged to the edge of the bridge deck and pulled onto the bridge deck. At this point, the wet joint formwork body 30 of this wet joint 60 is dismantled and recycled. After cleaning the residual concrete on the wet joint formwork body 30 and checking that the buckle 40 and the hanging rope are intact, it can be used for the next wet joint 60 construction or transferred to other construction sections for use. Step 6. Repeat the construction: According to the above steps 4 to 5, remove the wet joint formwork bodies 30 of other wet joints 60 in the same span in turn; for multi-hole bridges, the above construction can be carried out span by span; if multiple traction ropes 20 are set during construction (for example, a traction rope 20 is set between every two beams and slabs), multiple traction ropes 20 can be used to remove multiple wet joint formwork bodies 30 in parallel to further improve construction efficiency; it should be noted that when pulling multiple traction ropes 20, the force should be coordinated to avoid mutual interference between the wet joint formwork bodies 30; after all the wet joint formwork bodies 30 are removed, the traction ropes 20 are released, the traction ropes 20 and the ring parts 201 are recovered, cleaned and stored for use in subsequent projects.

[0025] The above-described embodiments demonstrate that the bridge wet-joint flying formwork and construction method of the present invention shifts the installation and removal of the wet-joint formwork body 30 to the bridge deck, eliminating the traditional hoisting and coordination required beneath the bridge. During construction, the wet-joint formwork body 30 is retrieved horizontally by towing ropes 20, eliminating the need for large lifting equipment to occupy the bridge for extended periods. This ensures safety and improves efficiency. Practical application results demonstrate that this method has achieved excellent results in wet-joint construction on high-pier bridges and overpasses, significantly shortening construction time, reducing construction costs, and minimizing the impact on traffic beneath the bridge.

[0026] The above are only preferred embodiments of the present invention and do not limit the implementation mode and protection scope of the present invention. For those skilled in the art, it should be aware that all solutions obtained by equivalent substitutions and obvious changes made using the description and illustrations of the present invention should be included in the protection scope of the present invention.

Claims

1. A bridge wet joint flying formwork, characterized in that: It includes a wet joint formwork body and a traction rope, which is arranged horizontally along the bridge and surrounds the adjacent beams and slabs that have been erected. A ring is fixedly connected to the traction rope; two suspension ropes are provided on the upper surface of the wet joint formwork body, and at least one buckle is provided on the lower surface of the wet joint formwork body; the size of the ring is larger than the opening size of the buckle, so that when the ring moves to the buckle position with the traction rope, it cannot pass through the buckle, thereby dragging the wet joint formwork body to move.

2. The bridge wet joint flying formwork according to claim 1 is characterized in that: At least two tie rod holes are provided on the wet joint formwork body, and nuts are fixedly provided at the tie rod holes for connecting tension bolts to fix the wet joint formwork body.

3. The bridge wet joint flying formwork according to claim 1 is characterized in that: The two hanging ropes are respectively connected to the two hanging rope holes on the upper surface of the wet joint template body, and the hanging rope holes are fixedly provided with hanging rings or hanging ears for connecting the hanging ropes.

4. The bridge wet joint flying formwork according to claim 3 is characterized in that: The positions of the two hanging rope holes on the wet joint formwork body are asymmetrical relative to the midline of the length direction of the wet joint formwork body, so that the wet joint formwork body has a predetermined tilt angle when suspended.

5. The bridge wet joint flying formwork according to claim 1 is characterized in that: The wet joint template body on one side where the buckle is located is in a lower position when suspended, so that this side contacts the traction rope first when the wet joint template body is lowered.

6. The bridge wet joint flying formwork according to claim 1 is characterized in that: The buckle includes a U-shaped card and an L-shaped self-locking part. A bolt hole is opened on one side of the U-shaped card, and the U-shaped card is fixedly connected to the lower surface of the wet joint template body by bolts; the L-shaped self-locking part is hinged to the U-shaped card and can rotate freely around the hinge axis.

7. The bridge wet joint flying formwork according to claim 6 is characterized in that: The weight of the long side of the L-shaped self-locking part is less than the weight of the short side of the L-shaped self-locking part, so that in a naturally drooping state, the long side of the L-shaped self-locking part is tilted upward and rests on the bolt of the U-shaped clip due to its smaller weight, and the short side of the L-shaped self-locking part droops to close the opening of the U-shaped clip.

8. The bridge wet joint flying formwork according to claim 1 is characterized in that: The traction rope may be one or more flexible ropes arranged in parallel.

9. The bridge wet joint flying formwork according to claim 8, characterized in that: The traction rope is a nylon rope or a steel wire rope.

10. A construction method for a bridge wet joint flying formwork according to any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Traction rope layout: Before the precast beams and slabs are erected, the traction ropes are pre-placed at appropriate locations on the box beams or pier tops. After all the precast beams and slabs of the same span are erected, the traction ropes are tightened along the transverse direction of the bridge, passing around the bottoms of adjacent beams and slabs and clinging to the sides of the beams and slabs. Then, a ring is attached to the traction ropes and both ends of the traction ropes are fixed, so that the traction ropes are tensioned below the bridge deck. Step 2: Installing the wet joint formwork body: On the bridge deck, use a winch or manually lower the wet joint formwork body from the gap of the wet joint to the designed position of the wet joint bottom using the two lifting ropes; adjust the inclination angle and position of the wet joint formwork body so that the wet joint formwork body fits tightly against the bottom of the beams and slabs on both sides; then insert the tension bolts through the tie rod holes and nuts on the wet joint formwork body to fix the wet joint formwork body to the bottom of the wet joint, completing the installation of the wet joint formwork body; Step 3: Wet joint construction: Tie the steel bars at the wet joints according to the design requirements and set up the side formwork at the top of the wet joints; after inspection and acceptance, pour the wet joint concrete and cure it to the design strength; Step 4: Removal of the wet joint formwork body: After the wet joint concrete reaches the demoulding strength, remove the tension bolts and the top side formwork; slowly lower the wet joint formwork body on the bridge deck through the two suspension ropes, so that it gradually separates from the concrete at the bottom of the wet joint; when the wet joint formwork body is lowered to the point where the buckle on its lower surface contacts the traction rope, the wet joint formwork body will continue to slide down along the traction rope due to the obstruction of the traction rope. At this time, the short side of the L-shaped self-locking part of the buckle first contacts the traction rope and is pushed open, and the traction rope slides into the inside of the U-shaped card; then the L-shaped self-locking part automatically resets under the action of its own weight, locking the traction rope in the U-shaped card, so that the wet joint formwork body is suspended on the traction rope; continue to slowly lower the wet joint formwork body until its weight is completely borne by the traction rope; Step 5: On the bridge deck, one end of the traction rope is pulled manually or by a winch, so that the traction rope drives the wet joint formwork body to move longitudinally along the bridge; when the ring on the traction rope moves with the rope to the buckle position of the wet joint formwork body, the ring is stuck in the buckle because the size of the ring is larger than the buckle opening. At this time, the traction rope is continued to be pulled to drag the wet joint formwork body toward the bridge deck until the wet joint formwork body is dragged onto the bridge deck, completing the removal and recovery of the wet joint formwork body; Step 6. Repeat the construction: According to the above steps 4 to 5, remove all wet joints and wet joint formwork bodies in the same span in turn; if there are multiple traction ropes, multiple traction ropes can be used to remove multiple wet joint formwork bodies in parallel to improve construction efficiency; after the removal is completed, the traction ropes and rings can be recovered and used for wet joint construction in the next span or the next construction section.

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