Formwork assembling and disassembling trolley for wet connection of prefabricated box girders and assembling and disassembling method of formwork assembling and disassembling trolley

Abstract

The invention provides a formwork assembly and disassembly trolley for prefabricated box girder wet connection and an assembly and disassembly method thereof.The formwork assembly and disassembly trolley comprises a first formwork structure, a second formwork structure, a wood formwork and a stay wire, the first formwork structure and the second formwork structure are located on the two sides of the same end of a box girder correspondingly and used for sealing the two side edges of a wet joint, and leakage during concrete pouring is avoided; the wood mold abuts against the bottom face of the box girder and is connected with the first formwork structure and the second formwork structure on the two sides to seal the bottom face of the wet connector, so that the two sides and the bottom face of the wet connector are sealed, only the top end is opened, and concrete pouring is convenient. The stay wire is fixed to the top face of the box girder, the two ends of the stay wire tighten the first formwork structure and the second formwork structure respectively, and the stay wire is used for providing pulling force to improve the stability of the first formwork structure and the second formwork structure. The formwork assembling and disassembling trolley for wet connection of the prefabricated box girders is high in safety, and the concrete pouring efficiency and pouring quality are greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction equipment, and particularly relates to a formwork installation and removal trolley for wet connection of precast box girders and an installation and removal method thereof. Background Art

[0002] During the construction of cross-sea bridges, it is usually divided into two categories. One is that multiple small box girders are placed side by side, and then the wet joints between two adjacent small box girders are poured with concrete and solidified into a wide beam body. In this way, the beam body is laid section by section, and the wet joints between two adjacent beam bodies are also poured with concrete to make the bridge as a whole firm. The other is that precast large box girders are arranged in a row, and the wet joints between every two adjacent large box girders are poured with concrete. The construction quality of the wet connection in the above two precast bridge constructions is particularly important. The quality of the construction will affect the stress state and service function of the bridge, and in severe cases, it will affect the service life of the bridge.

[0003] Traditional construction methods rely on manual erection of scaffolds and fixing of formworks, which have problems such as high risk of high-altitude operations, low formwork positioning accuracy, and concrete sticking to the formwork. Especially in harsh marine environments (such as wind and waves, tides, and salt spray corrosion), the construction efficiency and quality are difficult to guarantee. Summary of the Invention

[0004] In view of the above, it is necessary for the present invention to provide a formwork installation and removal trolley that is safe and reliable and can improve the efficiency and quality of concrete pouring.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A formwork installation and removal trolley for wet connection of precast box girders includes a first formwork structure located on the outermost side of the box girder, with the top fixed on the top surface of the box girder and the bottom suspended below the box girder, for sealing the side of the wet joint; a second formwork structure located in the wet joint between the juxtaposed box girders and corresponding to the first formwork structure, for sealing the other side of the wet joint; a wooden formwork installed at the bottom of the box girder, and the first formwork structure and the second formwork structure press the formwork to be fixed on the bottom surface of the box girder, for sealing the bottom of the wet joint; a wire rope fixed on the top surface of the box girder and located between the first formwork structure and the second formwork structure, and both ends of the wire rope are respectively tightened on the first formwork structure and the second formwork structure, for providing a pulling force to increase the stability of the first formwork structure and the second formwork structure.

[0007] Further, the first formwork structure includes a first traveling seat, a first truss, and a first formwork group. The first traveling seat is movably arranged on the top surface of the box girder, the first truss is fixedly connected to the first traveling seat, the first formwork group is installed on the first truss, and the first truss abuts against the first formwork group to move, for sealing the side of the wet joint.

[0008] Further, the first traveling seat includes a load-bearing frame, four traveling wheels, and two driving motors. The four traveling wheels are all installed at the bottom end of the load-bearing frame. The two driving motors are respectively connected to two traveling wheels at the front end in the moving direction of the load-bearing frame, and the driving motors drive the traveling wheels to move along the length direction of the box girder.

[0009] Further, the first truss includes a top beam portion, a vertical beam portion, and a bottom beam portion. One end of the top beam portion is fixed above the load-bearing frame, and the other end extends horizontally outside the box girder to form an extended end. The vertical beam portion is fixedly connected below the extended end of the top beam portion. The bottom beam portion is fixedly connected to one side of the bottom end of the vertical beam portion and corresponds to the top beam portion. A bottom plate is provided on the bottom surface of the bottom beam portion to form a working platform for workers to stand on the working platform to install the first formwork group.

[0010] Further, the first truss further includes a plurality of telescopic connecting rods, a tensioning steel wire, and a manual hoist. The plurality of telescopic connecting rods are installed on the bottom beam portion. A pulley is installed at one end of each telescopic connecting rod located inside the bottom cross beam, and the other end extends towards the side of the box girder and is provided with a quick latch for clamping the first formwork group. Fixed pulleys are installed on both sides of each telescopic connecting rod and fixed on the bottom beam portion. The tensioning steel wire is wound between each telescopic connecting rod and a plurality of fixed pulleys. The manual hoist is connected to one end of the tensioning steel wire, and the manual hoist drives the tensioning steel wire to wind up, pushing against the telescopic rod to drive the first formwork group to abut against the side of the box girder.

[0011] Further, the second formwork structure includes a second traveling seat, a second truss, and a second formwork group. The second traveling seat has the same structure as the first traveling seat and spans across the top surface of adjacent box girders. The second truss extends vertically downward through the second traveling seat. The second formwork group is installed on the second truss, and the second truss pushes the second formwork group to abut against the side of the box girder.

[0012] Further, the second truss includes an upper beam portion, a middle beam portion, and a lower beam portion. The upper beam portion is fixed on the top of the second traveling seat, and a vertical hanging rod is provided at the geometric center of the upper beam portion. The upper end of the hanging rod is installed with a second manual hoist. The middle beam portion is located in the wet joint, and a kit is fixedly connected to the top end. The kit is sleeved on the hanging rod and connected to the second manual hoist, and the second manual hoist drives the middle beam portion to lift and lower. The lower beam portion is horizontally fixed at the lower end of the upper beam portion, and second formwork group counterweights are installed at both ends respectively.

[0013] Further, the second formwork group has the same structure as the first formwork group, and the top end of the second formwork group can fix the wet joint formwork to seal the bottom surface of the wet joint.

[0014] In addition, the present invention also provides a method for assembling and disassembling the formwork of the above-mentioned formwork assembling and disassembling trolley for precast box girder wet joints, including the following implementation steps:

[0015] A. Move the first and second traveling seats to the top corresponding to the wet joint, adjust the bottom support to separate the traveling wheels from the top surface of the box beam, and then adjust the first and second traveling seats to be level with the top surface of the box beam;

[0016] B. Hoist the top beam and upper beam onto the first and second traveling blocks respectively and secure them. Then hoist the counterweight and place it on the top beam. Then, take the guy wire and secure it to the top surface of the box beam. Tie the ends of the guy wire to the top beam and upper beam respectively.

[0017] C. Sequentially hoist the vertical beams and the middle beams to secure them to the top beam and upper beams, then hoist the bottom beam with the first formwork set to secure it to the vertical beams. Finally, hoist the lower beam with the second formwork set to secure it to the middle beams. Adjust the height of the middle beam using the second manual hoist, then continue hoisting the assembly blocks and place them on the lower beams.

[0018] D. The staff descends to the work platform, adjusts the first and second formwork groups to align with both sides of the wet joint, installs the wooden formwork against the bottom surface of the box girder, shakes the manual hoist to reel in the tensioning rope, squeezes the telescopic connecting rod to move the first and second formwork groups to seal the sides of the wet joint, and tightens the wooden formwork to seal the bottom surface of the wet joint;

[0019] E. After the concrete pouring is completed, the staff goes down to the work platform to remove the quick-release pins, so that the first and second formwork groups are separated from the bottom beam and lower beam respectively, and the first and second running blocks are moved to the next wet joint and fixed, and the above step D is repeated to continue pouring;

[0020] F. After pouring is completed, dismantle the first formwork structure and the second formwork structure in reverse order according to steps C to A.

[0021] The beneficial effects of the present invention are:

[0022] 1. The first formwork group is installed on the first truss, and a manual hoist and a telescopic link are designed to quickly install the side of the first formwork group corresponding to the wet joint, and the first truss is fixed to the first traveling seat, so that the first traveling seat can drive the first truss to move along the bridge laying direction, which is convenient for installing the formwork to seal the wet joint and improve the efficiency of concrete pouring.

[0023] 2. Both the first formwork group and the second formwork group are made of stainless steel, which avoids concrete bonding and reduces the concrete pouring defect rate.

[0024] 3. The designed bottom beam and lower beam are fixed to the vertical beam and middle beam respectively by screw connection, and the first template group and the second template group are connected by quick pins, which is convenient for installation or disassembly and improves the assembly time of the template trolley.

[0025] 4. The first formwork structure and the second formwork structure fixed on both sides of the box girder are applicable to the harsh environment of strong winds and big waves at sea, solving the problem that it is difficult to support and fix on the sea surface during pouring. At the same time, the trolley system is equipped with a construction platform, solving the problem that it is difficult for personnel to operate. Brief Description of the Drawings

[0026] Figure 1 It is a schematic diagram of the present application installed on the box girder;

[0027] Figure 2 It is a state diagram of the first formwork group and the second formwork group abutting against the side of the box girder;

[0028] Figure 3 It is a plan view of the first formwork structure;

[0029] Figure 4 It is a plan view of the second formwork structure.

[0030] Description of the Reference Numerals in the Drawings:

[0031] 1. First formwork structure; 11. First traveling seat; 111. Load-bearing frame; 112. Traveling wheel; 113. Driving motor; 12. First truss; 121. Top beam part; 122. Vertical beam part; 123. Bottom beam part; 124. Telescopic connecting rod; 125. Tension steel wire; 126. Manual hoist; 13. First formwork group; 131. Side formwork; 132. Top formwork; 2. Second formwork structure; 21. Second traveling seat; 22. Second truss; 221. Upper beam part; 222. Middle beam part; 223. Lower beam part; 224. Second manual hoist; 23. Second formwork group; 3. Wooden formwork; 4. Stay wire. Detailed Embodiment

[0032] The following details the specific embodiments of the present application with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustrating and explaining the present application, and are not intended to limit the present application.

[0033] As Figure 1 shown, the embodiment of the present invention provides a formwork assembling and disassembling trolley for wet connection of precast box girders, including a first formwork structure 1, a second formwork structure 2, a wooden formwork 3 and a stay wire 4. The first formwork structure 1 and the second formwork structure 2 are respectively located on both sides of the same end of the box girder, used to seal both sides of the wet joint to prevent leakage during concrete pouring. The wooden formwork 3 abuts against the bottom surface of the box girder and is connected to the first formwork structure 1 and the second formwork structure 2 on both sides, sealing the bottom surface of the wet joint, so that both sides and the bottom surface of the wet joint are sealed, leaving only the top opening, which is convenient for pouring concrete. The stay wire 4 is fixed on the top surface of the box girder and is set to at least one. Both ends of the stay wire 4 are respectively tightened on the first formwork structure 1 and the second formwork structure 2 to provide tension and increase the stability of the first formwork structure 1 and the second formwork structure 2.

[0034] As Figure 2 and Figure 3 shown, the first formwork structure 1 is in a "C" shape and abuts against the outermost side of the box girder. It includes a first traveling base 11, a first truss 12, and a first formwork group 13. The first traveling base 11 is movably arranged on the top surface of the box girder. The first truss 12 is fixedly connected to the first traveling base 11, so that the first traveling base 11 drives the first truss 12 to move to a position corresponding to the wet joint. The first formwork group 13 is installed on the first truss 12, and the first truss 12 abuts against and moves the first formwork group 13 to seal the side of the wet joint.

[0035] The first traveling base 11 includes a load-bearing frame 111, four traveling wheels 112, and two driving motors 113. The load-bearing frame 111 is a square frame composed of several metal square tubes. The four traveling wheels 112 are respectively installed at each vertex of the bottom end of the load-bearing frame 111, enabling the load-bearing frame 111 to move smoothly. The two driving motors 113 are respectively connected to two traveling wheels 112 at the front end of the moving direction of the load-bearing frame 111. When the driving motors 113 rotate, they drive the traveling wheels 112 to move along the length direction of the box girder. A steering rod is connected between the two traveling wheels 112 provided with driving motors 113, and both ends of the steering rod are respectively hinged to the two traveling wheels 112 to control the synchronous steering of the two traveling wheels 112. Further, liftable bottom supports are installed at the four vertices of the load-bearing frame 111. The bottom supports adopt structures such as jacks or screw lifting rods that can support each traveling wheel 112 in a suspended state, and each bottom support is controlled individually to facilitate adjusting the levelness of the load-bearing frame 111.

[0036] The first truss 12 is made by welding or screwing several metal square tubes, and includes a top beam part 121, a vertical beam part 122, and a bottom beam part 123. One end of the top beam part 121 is fixed above the load-bearing frame 111, and the other end extends horizontally outside the box girder to form an extended end. The vertical beam part 122 is fixedly connected below the extended end of the top beam part 121, and a guardrail ladder is provided inside the vertical beam part 122 for staff to climb. The bottom beam part 123 is fixedly connected to one side of the bottom end of the vertical beam part 122 and corresponds to the top beam part 121. Counterweights are installed on the top beam part 121 to make the bottom beam part 123 suspended outside the box girder stable without shaking or tipping. It can be understood that a bottom plate is provided on the bottom surface of the bottom beam part 123 to form a working platform for staff to stand on the working platform to install the first formwork group 13. After the staff completes the installation of the first formwork group 13, they can climb to the top surface of the box girder through the guardrail ladder inside the vertical beam part 122.

[0037] When a working platform needs to be erected at the wet joint, the staff moves the first traveling seat 11 to the corresponding wet joint, then adjusts the bottom bracket to descend, raises the supporting traveling wheels 112 away from the top surface of the box girder, and adjusts the descending height of each bottom bracket to ensure that the bearing frame 111 is parallel to the horizontal plane of the box girder. Then, use a crane to hoist the first truss 12 to the side of the box girder where the first traveling seat 11 is provided, clamp the open end of the "C"-shaped first truss 12 on the side of the box girder, and connect the first truss 12 to the bearing frame 111 correspondingly. Fix the top beam part 121 to the bearing frame 111 by screwing. Then, hoist and install the counterweight blocks on the top beam part 121. In this way, the staff can enter the working platform formed by the bottom beam part 123 through the guardrail ladder of the vertical beam part 122 to carry out the installation operation of the first formwork group 13.

[0038] As Figure 3 shown, in order to install the first formwork group 13 more quickly and adjust the first formwork group 13 to be fully abutted against the side of the box girder after installation, a number of telescopic connecting rods 124, two tension steel ropes 125 and two manual hoists 126 are also provided on the bottom beam part 123. The telescopic connecting rods 124 are set into two groups. One group is arranged horizontally at one end of the bottom beam part 123 away from the vertical frame beam 122 to form a horizontal group; the other group is arranged vertically at the top of the bottom beam part 123 to form a vertical group. Each group of telescopic connecting rods 124 is at least set to two. One end of each telescopic connecting rod 124 located inside the bottom beam part 123 is installed with a pulley, and fixed pulleys are installed on both sides of each telescopic connecting rod 124 on the bottom beam part 123. Quick pins are provided at the ends of the telescopic connecting rods 124 extending outside the bottom beam part 123 for quickly installing and disassembling the first formwork group 13. The two tension steel ropes 125 are respectively wound between each group of telescopic connecting rods 124 and a number of corresponding fixed pulleys of this group of telescopic connecting rods 124. The two manual hoists 126 are both installed on the working platform. One end of the tension steel rope 125 wound around the horizontal group of telescopic connecting rods 124 is fixed on the bottom beam part 123, and the other end is connected to one of the manual hoists 126. The staff shakes the manual hoist 126 to wind up the tension steel rope 125, so that the tension steel rope 125 pushes the horizontal group of telescopic connecting rods 124 close to the side of the box girder; the other tension steel rope 125 is threaded between the vertical group of telescopic connecting rods 124 and the corresponding number of fixed pulleys. One end of this tension steel rope 125 is fixed on the vertical beam part 122, and the other end is connected to the remaining one manual hoist 126.

[0039] The first formwork group 13 includes a side formwork 131 and a top formwork 132. Both the side formwork 131 and the top formwork 132 are made of stainless steel to improve the quality of concrete pouring. A first pin hole for clamping the quick pins of the telescopic connecting rods 124 is provided at the middle position of the side formwork 131. The first pin hole is clamped and fixed with the two telescopic connecting rods 124 of the horizontal group. A support plate is installed at the bottom end of the side formwork 131 for placing the wooden formwork 3. The top formwork 132 is connected to the two telescopic connecting rods 124 of the vertical group, and a second pin hole is provided in the middle area. The second pin hole is clamped with the quick pins of the two telescopic connecting rods 124. Further, side tie rods are provided on the side formwork 131. The side tie rods pass through the side formwork and are fixed to the box girder for fixing the side formwork 131 after sealing the side of the wet joint. The top formwork 132 is provided with upper tie rods. The upper tie rods pass through the box girder and protrude outside the top surface of the box girder to fix the top formwork 132 to the box girder.

[0040] When installing the first formwork group 13, the staff stands on the working platform of the bottom beam part 123, installs the side formwork 131 on the telescopic connecting rods 124 of the horizontal group, corresponding to the side of the wet joint, and then rotates the manual hoist 126 to drive the tensioning steel rope 125 to wind up. The tensioning steel rope 125 is tightened against the telescopic connecting rods 124 to move, thereby driving the side formwork 131 to abut against the side of the box girder. Then, the side tie rods are fixed to the box girder. After the installation of the side formwork 131 is completed, the staff takes the top formwork 132 and installs it on the two telescopic connecting rods 124 of the vertical group and corresponds to the wet joint. Then, rotate another manual hoist 126 to drive the tensioning steel rope 125 connected thereto to wind up, thereby abutting against the corresponding telescopic connecting rods 124 to drive the top formwork 132 to abut against the side of the box girder, completely sealing the side of the wet joint, and then fixing the upper tie rods protruding to the top surface of the box girder.

[0041] As Figure 2 and Figure 4 shown, the second formwork structure 2 is attached to the other side of the box girder in an "I" shape, including a second traveling base 21, a second truss 22, and a second formwork group 23. The second traveling base 21 is arranged on the top surface of the box girder opposite to the first traveling base 11 and has the same structure. The second truss 22 passes through the second traveling base 21 and extends vertically downward. The second formwork group 23 is installed on the second truss 22. The second truss 22 pushes the second formwork group 23 to abut against the side of the box girder.

[0042] Preferably in this embodiment, the second formwork structure 2 is arranged in the wet joint between the box girders placed side by side. The second traveling base 21 straddles the top surfaces of two adjacent box girders. The upper end of the second truss 22 is fixed above the second traveling base 21, and the lower end penetrates into the wet joint. The second formwork group 23 is installed on the side of the lower end of the second truss 22 close to the first formwork structure 1, and a counterweight is placed on the other side.

[0043] The second truss 22 includes an upper beam portion 221, a middle beam portion 222, and a lower beam portion 223. The upper beam portion 221 is fixed to the top of the second traveling seat 21, and a vertical suspension rod is provided at the geometric center of the upper beam portion 221. The upper end of the suspension rod is installed with a second manual hoist 224. The middle beam portion 222 is in the shape of a ladder, and a kit is fixedly connected to the top end. The kit is sleeved on the suspension rod and connected to the second manual hoist 224. Rotating the second manual hoist 224 drives the lifting of the middle beam portion 222. The lower beam portion 223 is fixed to the lower end of the upper beam portion 221. The two ends of the lower beam portion 223 extend towards the box girders on both sides respectively. One end close to the first formwork structure 1 is used to install the second formwork group 23. The second formwork group 23 has the same structure as the first formwork group 13. A counterweight is placed at the end of the lower beam portion 223 away from the first formwork structure 1 to balance the weight of the second formwork group 23 and keep the lower beam portion 223 horizontal.

[0044] In this embodiment, the top end of the second formwork group 23 corresponds to the wet joint of the bridge, and a wet joint formwork can be installed to seal the bottom surface of the wet joint for workers to pour the wet joint while pouring the wet joint with concrete.

[0045] Please refer to Figure 2 , the wooden formwork 3 and the guy wire 4 are respectively located at the upper and lower ends of the box girder. The wooden formwork 3 is located at the bottom surface of the box girder and is fastened to the bottom end of the wet joint under the extrusion of the first formwork group 13 and the second formwork group 23. The guy wire 4 fixes the top surface of the box girder, and the two ends are respectively connected to the first formwork structure 1 and the second formwork structure 2 to fix the first formwork group 13 and the second formwork group 23 on both sides of the box girder.

[0046] The installation and removal method of the formwork installation and removal trolley for the wet joint of precast beams provided by the present invention is as follows:

[0047] A. Move the first traveling seat 11 and the second traveling seat 21 to the position above the wet joint, adjust the bottom support so that the traveling wheels 112 are separated from the top surface of the box girder, and then adjust the first traveling seat 11 and the second traveling seat 21 to be horizontal with the top surface of the box girder;

[0048] B. Hoist the top beam portion 121 and the upper beam portion 221 onto the first traveling seat 11 and the second traveling seat 21 respectively and fix them. Then hoist the counterweight and place it on the top beam portion 121. Then take the guy wire 4 and fix it on the top surface of the box girder. The two ends of the guy wire 4 are respectively tied to the top beam portion 121 and the upper beam portion 221;

[0049] C. Hoist the vertical beam portion 122 and the middle beam portion 222 in sequence and fix them to the top beam portion 121 and the upper beam portion 221 respectively. Then hoist the bottom beam portion 123 installed with the first formwork group 13 and fix it to the vertical beam portion 122. Then hoist the lower beam portion 223 installed with the second formwork group 23 and fix it to the middle beam portion 222. Adjust the height of the middle beam portion 223 through the second manual hoist 224. Continue to hoist the assembled block and place it on the lower beam portion 223;

[0050] D. The staff descends to the working platform, adjusts the first formwork group 13 and the second formwork group 23 to correspond to both sides of the wet joint, installs the wooden formwork 3 to abut against the bottom surface of the box girder, shakes the manual hoist 126 to wind up and tension the steel rope 125, and the squeezing telescopic connecting rod 124 drives the first formwork group 13 and the second formwork group 23 to move and seal the side of the wet joint, and squeezes the wooden formwork 3 to seal the bottom surface of the wet joint;

[0051] E. After the concrete pouring is completed, the staff descends to the working platform to remove the quick pins, so that the first formwork group 13 and the second formwork group 23 are disengaged from the bottom beam part 123 and the lower beam part 223 respectively, moves the first traveling seat 11 and the second traveling seat 21 to the next wet joint for fixing, and repeats the above step D for pouring;

[0052] F. After the pouring is completed, the first formwork structure 1 and the second formwork structure 2 are removed in reverse order according to the steps from C to A.

[0053] Understandably, when pouring a bridge formed by arranging multiple small box girders side by side, a formwork trolley composed of installing the first formwork structure 1 on the two outermost small box girders and installing the second formwork structure 2 in the wet joint between two adjacent small box girders is adopted. When pouring a bridge formed by arranging a single large box girder in a line, a formwork trolley composed of installing the first formwork structure 1 on both sides of the large box girder is adopted.

[0054] The above embodiments only represent the implementation modes of the present invention, but should not be construed as limiting the scope of the present invention patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several deformations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent should be subject to the appended claims.

Claims

1. A formwork installation and removal trolley for the wet connection of precast box girders, characterized in that Comprising: A first formwork structure (1), located on one side of the box girder, with its top end fixed to the top surface of the box girder and its lower end suspended below the box girder, for sealing the side of the wet joint; A second formwork structure (2), located within the wet joint between the juxtaposed box girders and corresponding to the first formwork structure (1), for sealing the other side of the wet joint; A wooden formwork (3), installed at the lower end of the box girder, and the first formwork structure (1) and the second formwork structure (2) press against the formwork (3) and are fixed to the bottom surface of the box girder to seal the bottom of the wet joint; A guy wire (4), fixed to the top surface of the box girder and located in the middle of the first formwork structure (1) and the second formwork structure (2), with both ends of the guy wire (4) tightly pulling the first formwork structure (1) and the second formwork structure (2) respectively, to provide a pulling force to increase the stability of the first formwork structure (1) and the second formwork structure (2).

2. The formwork assembling and disassembling trolley for wet connection of precast box girders according to claim 1, wherein, The first formwork structure (1) includes a first traveling base (11), a first truss (12), and a first formwork group (13). The first traveling base (11) is movably arranged on the top surface of the box girder. The first truss (12) is fixedly connected to the first traveling base (11). The first formwork group (13) is installed on the first truss (12). The first truss (12) abuts against the first formwork group (13) to move and seal the side of the wet joint.

3. The formwork assembly and disassembly trolley for wet connection of precast box girders according to claim 2, wherein, The first traveling base (11) includes a load-bearing frame (111), four traveling wheels (112), and two driving motors (113). The four traveling wheels (112) are all installed at the bottom end of the load-bearing frame (111). The two driving motors (113) are respectively connected to two traveling wheels (112) at the front end of the moving direction of the load-bearing frame (111). The driving motors (113) drive the traveling wheels (112) to move along the length direction of the box girder.

4. The formwork assembly and disassembly trolley for precast box girder wet connection according to claim 3, characterized in that, The first truss (12) includes a top beam part (121), a vertical beam part (122), and a bottom beam part (123). One end of the top beam part (121) is fixed above the load-bearing frame (111), and the other end horizontally extends outside the box girder to form an extended end. The vertical beam part (122) is fixedly connected below the extended end of the top beam part (121). The bottom beam part (123) is fixedly connected to one side of the bottom end of the vertical beam part (122) and corresponds to the top beam part (121). And a bottom plate is provided on the bottom surface of the bottom beam part (123) to form a working platform for workers to stand on the working platform to install the first formwork group (13).

5. A formwork installation and removal trolley for wet connection of precast box girders according to claim 4, characterized in that, The first truss (12) further includes a plurality of telescopic connecting rods (124), a tension steel cable (125), and a manual hoist (126). The plurality of telescopic connecting rods (124) are installed on the bottom beam portion (123). At one end of each telescopic connecting rod (124) located within the bottom cross beam (123), a pulley is installed, and the other end extends towards the side of the box girder and is provided with a quick pin for clamping the first formwork group (13). Fixed pulleys are installed on both sides of each telescopic connecting rod (124) and are fixed to the bottom beam portion (123). The tension steel cable (125) is wound around each telescopic connecting rod (124) and a plurality of fixed pulleys. The manual hoist (126) is connected to one end of the tension steel cable (125). The manual hoist (126) drives the tension steel cable (125) to wind up, pushing against the telescopic connecting rod (124) to drive the first formwork group (13) to abut against the side of the box girder.

6. The formwork assembly and disassembly trolley for precast box girder wet connection according to claim 5, characterized in that, The second formwork structure (2) includes a second traveling seat (21), a second truss (22), and a second formwork group (23). The second traveling seat (21) has the same structure as the first traveling seat (11) and straddles the top surface of the adjacent box girder. The second truss (21) passes through the second traveling seat (21) and extends vertically downward. The second formwork group (23) is installed on the second truss (21). The second truss (21) pushes the second formwork group (23) to abut against the side of the box girder.

7. A formwork assembly and disassembly trolley for wet connection of precast box girders according to claim 6, characterized in that, The second truss (22) includes an upper beam portion (221), a middle beam portion (222), and a lower beam portion (223). The upper beam portion (221) is fixed to the top of the second traveling seat (21), and a vertical suspension rod is provided at the center of the upper beam portion (221). A second manual hoist (224) is installed at the upper end of the suspension rod. The middle beam portion (222) is located within the wet joint, and a kit is fixedly connected to the top end. The kit is sleeved on the suspension rod and is connected to the second manual hoist (224). The second manual hoist (224) drives the middle beam portion (222) to lift and lower. The lower beam portion (223) is horizontally fixed to the lower end of the upper beam portion (221), and counterweights of the second formwork group (23) are installed at both ends.

8. A formwork installation and removal trolley for wet connection of precast box girders according to claim 7, characterized in that, The second formwork group (23) has the same structure as the first formwork group (13). The top end of the second formwork group (23) is used to fix the wet joint formwork and seal the bottom surface of the wet joint.

9. A method for assembling and disassembling formwork of a formwork assembling and disassembling trolley for wet connection of precast box girders according to any one of claims 1-8, characterized in that, The specific process is as follows: A. Move the first traveling seat (11) and the second traveling seat (21) to above the wet joint. Adjust the bottom support so that the traveling wheels (112) are separated from the top surface of the box girder, and then adjust the first traveling seat (11) and the second traveling seat (21) to be horizontal with the top surface of the box girder. B. Hoist and fix the top beam portion (121) and the upper beam portion (221) onto the first traveling seat (11) and the second traveling seat (21) respectively. Then hoist and place the counterweights on the top beam portion (121). Then take the guy wire (4) and fix it to the top surface of the box girder. The two ends of the guy wire (4) are respectively tied to the top beam portion (121) and the upper beam portion (221). C. Sequentially hoist the vertical beam (122) and the middle beam (222) and fix them to the top beam (121) and the upper beam (221), then hoist the bottom beam (123) with the first template group (13) and fix them to the vertical beam (122), then hoist the lower beam (223) with the second template group (23) and fix them to the middle beam (222), and adjust the height of the middle beam (223) by the second manual hoist (224), and continue to hoist the assembly blocks and place them on the lower beam (223); D. The staff goes down to the working platform, adjusts the first template group (13) and the second template group (23) to correspond to the two sides of the wet joint, installs the wooden formwork (3) against the bottom surface of the box beam, shakes the manual hoist (126) to reel in the tensioning rope (125), squeezes the telescopic connecting rod (124) to drive the first template group (13) and the second template group (23) to move and seal the sides of the wet joint, and squeezes the wooden formwork (3) to seal the bottom surface of the wet joint; E. After the concrete pouring is completed, the staff goes down to the work platform to remove the quick-release pin, so that the first template group (13) and the second template group (23) are separated from the bottom beam (123) and the lower beam (223) respectively, and the first walking seat (11) and the second walking seat (21) are moved to the next wet joint to be fixed, and the above step D is repeated to pour; F. After pouring is completed, the first formwork structure (1) and the second formwork structure (2) are dismantled in reverse order according to steps C to A.

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