A wet joint construction apparatus and a wet joint construction method

Abstract

The application relates to a wet joint construction equipment and a wet joint construction method, and belongs to the field of bridge construction technology. The equipment comprises a bottom die, a formwork support, a feeding rack, a positioning frame and a fixing assembly, the bottom die is laid on the formwork support; the feeding rack is arranged at one end of a prefabricated box girder, a feeding hopper is arranged on the feeding rack in an inclined mode, a first winding assembly and a first steel wire rope are arranged on the feeding rack, the first winding assembly is used for paying out or winding back the first steel wire rope, the first steel wire rope enters the feeding hopper from the top of the feeding hopper and is connected with one end of the formwork support; the positioning frame is arranged at the end of the prefabricated box girder far away from the feeding rack, a second winding assembly and a second steel wire rope are arranged on the positioning frame, the second winding assembly is used for paying out or winding back the second steel wire rope, the second steel wire rope is connected with the other end of the formwork support; and the fixing assembly is used for tightly fixing the formwork support at the bottom of the prefabricated box girder. The application has the effect of facilitating the bridge wet joint construction operation.

Description

Technical Field

[0001] This application relates to the field of bridge construction technology, and in particular to a wet joint construction device and a wet joint construction method. Background Technology

[0002] During bridge construction, precast box girders from the prefabrication yard are transported to the construction site. Multiple precast box girders are then hoisted and installed onto the support beams in sequence. The precast box girders are hollow inside and have flanges on both sides of the upper part. The joints between the flanges of two adjacent precast box girders, which are connected by cast-in-place concrete, are called wet joints. During the construction of wet joints, a wet joint bottom formwork needs to be laid at the bottom of two adjacent precast box girders, and concrete is poured on the bottom formwork.

[0003] Currently, the construction of wet joint formwork for precast box girders is carried out manually. The bottom formwork is placed below the bridge site, and workers on the bridge deck control steel wire ropes to lift the bottom formwork from below the bridge site to the bottom of the wet joint. The bottom formwork is then fixed between two adjacent precast box girders. After the reinforcing steel is laid in the wet joint, concrete is poured. After the concrete has solidified, the bottom formwork is removed and lowered to the ground via steel wire ropes, thus completing the construction of the wet joint.

[0004] Regarding the aforementioned technologies, when there is a river or ditch directly below the bridge site, it is impossible to place the bottom formwork and related construction equipment below the bridge site, making it inconvenient to install the bottom formwork and causing difficulties in wet joint construction. Summary of the Invention

[0005] To facilitate the construction of wet joints in bridges, this application provides a wet joint construction device and a wet joint construction method.

[0006] On the one hand, this application provides a wet joint construction device, which adopts the following technical solution:

[0007] A wet joint construction device includes a bottom formwork and a formwork support, the bottom formwork being laid on the formwork support; a material feeding rack, disposed at one end of a precast box girder, the material feeding rack having an inclined feeding hopper for the formwork support to pass through, the material feeding rack having a first winding assembly with a first steel wire rope, the first winding assembly being used to release or retract the first steel wire rope, the first steel wire rope entering the feeding hopper from the top and connecting to one end of the formwork support; a positioning frame, disposed at the end of the precast box girder away from the material feeding rack, the positioning frame having a second winding assembly with a second steel wire rope wound around it, the second winding assembly being used to release or retract the second steel wire rope, the second steel wire rope being connected to the other end of the formwork support; and a fixing assembly, connected to the formwork support, for securing the formwork support against the bottom of the precast box girder.

[0008] By adopting the above technical solution, the formwork support is first lowered along the hopper to the bottom of the precast box girder. Then, the formwork support is lifted by the first and second steel wire ropes, so that the bottom formwork is attached to the bottom of the precast box girder. The formwork support is then fixed to the bottom of the precast box girder by the fixing components, which facilitates the installation of the bottom formwork at the bottom of the wet joint. During demolding, the fixing components are removed, the second winding component releases the second steel wire rope, and the first winding component retracts the first steel wire rope, so that the formwork support rises along the hopper. The formwork support is then moved out by the hoisting machinery, which facilitates the recovery of the bottom formwork after demolding. This facilitates the installation and movement of the formwork, especially when there is a river or ditch under the bridge site, so that the formwork installation and disassembly operations can be carried out, which is convenient for wet joint construction operations.

[0009] Optionally, the first winding assembly includes a first winding reel and a first drive motor. The first winding reel is coaxially arranged on the output shaft of the first drive motor. The first wire rope is wound around the first winding reel. A fixed pulley is rotatably installed on the top of the discharge hopper. The first wire rope extends into the discharge hopper after passing through the fixed pulley.

[0010] By adopting the above technical solution, the first drive motor drives the first winding wheel to rotate, thereby driving the first winding wheel to wind or unwind the first wire rope, thus facilitating the lifting or lowering of the template support through the first wire rope; the fixed pulley avoids the first wire rope from breaking due to direct friction with the feed hopper.

[0011] Optionally, the second winding assembly includes a second winding reel and a second drive motor. The second winding reel is rotatably mounted on the positioning frame, and the second drive motor is connected to the second winding reel and is used to drive the second winding reel to rotate.

[0012] By adopting the above technical solution, the second drive motor drives the second winding wheel to rotate, and the second winding wheel winds up or unwinds the second steel wire rope wound on it, thereby facilitating the lifting or lowering of the template support.

[0013] Optionally, guide rails are provided at both ends of the precast box girder, with the length direction of the guide rails perpendicular to the length direction of the precast box girder. The material feeding rack and the positioning rack are slidably mounted on the guide rails at both ends of the precast box girder.

[0014] By adopting the above technical solution, the material feeding rack and the positioning rack are slidably installed on the guide rails at both ends of the precast box girder, which facilitates driving the material feeding rack and the positioning rack to move on the precast box girder perpendicular to the length of the precast box girder. This makes it easier for the material feeding rack and the positioning rack to move above multiple wet joints, and facilitates the construction operation of multiple wet joints.

[0015] Optionally, the feeding rack is provided with a counterweight, and the counterweight and the feeding hopper are located on opposite sides of the guide rail.

[0016] By adopting the above technical solution, a counterweight is installed on the feeding rack. The counterweight and the feeding hopper are located on opposite sides of the guide rail, so that when the template support moves in the feeding hopper, the center of gravity of the feeding rack is always located on the guide rail, thereby preventing the feeding rack from tipping over.

[0017] Optionally, the fixing component includes a hanging rod, a suspension rod, and a self-locking component. The two ends of the hanging rod are respectively placed on the surfaces of two adjacent precast box girders. The self-locking component is set on the formwork support. One end of the suspension rod is detachably connected to the hanging rod, and the other end passes vertically through the bottom formwork and is connected to the self-locking component. When the bottom formwork tends to move downward, the self-locking component blocks the suspension rod.

[0018] By adopting the above technical solution, the two ends of the hanging rod are erected on the surface of two adjacent precast box girders. After the hanger is fixed on the hanging rod, the other end of the hanger extends vertically downward into the self-locking part of the formwork support. When the bottom mold tends to move downward, the self-locking part blocks the hanger, thereby tightening and fixing the formwork support to the bottom of the precast box girder, achieving the effect of facilitating the fixing of the bottom mold.

[0019] Optionally, the self-locking component includes a mounting block, a self-locking plate, a spring, and an electromagnet. The mounting block is disposed within the template support and has a through hole that is smaller at the top and larger at the bottom. A sliding groove is provided on the side wall of the through hole. The self-locking plate is engaged and slidably disposed within the sliding groove. Multiple self-locking plates are provided on the side wall of the through hole. The lifting rod is vertically inserted into the through hole, and the side of the self-locking plate facing the lifting rod is in contact with the lifting rod. The spring is disposed on the side wall of the through hole, with one end connected to the self-locking plate and the other end connected to the mounting block. The spring causes the self-locking plate to always have an upward tendency to move. The electromagnet is disposed at the bottom of the mounting block.

[0020] By adopting the above technical solution, when the hanger is vertically inserted into the through hole, the hanger pushes the self-locking plates downwards, and the gap between the multiple self-locking plates tends to widen, allowing the hanger to be smoothly inserted into the through hole. When concrete is poured on the bottom formwork, the bottom formwork and the formwork support are subjected to force and tend to move downwards. At this time, under the action of the spring and friction, the multiple self-locking plates tend to move upwards along the inner wall of the through hole, reducing the gap between the multiple self-locking plates. The multiple self-locking plates press the hanger tightly against the mounting block, thereby fixing the formwork support in the current position. This avoids the situation where the formwork support and the bottom formwork move downwards, causing concrete slurry to flow out from the gap between the bottom formwork and the precast box girder.

[0021] On the other hand, this application provides a method for constructing wet joints, comprising the following steps:

[0022] S1: Lay the bottom formwork on the formwork support, and install the material feeding frame and positioning frame at both ends of the precast box girder respectively; S2: Use hoisting machinery to lower the formwork support from the top of the material feeding hopper, and connect the second wire rope to the lower end of the formwork support; S3: Continue to lower the formwork support. When the top of the formwork support is inside the material feeding hopper, connect the first wire rope to the top of the formwork support, remove the hoisting machinery, release the first wire rope, and drive the formwork support to lower until it is detached from the material feeding hopper; S4: Rewind the first wire rope and the second wire rope, and drive the formwork support to rise until the bottom formwork is flush with the bottom of the precast box girder; S5: Utilize... S6: Secure the formwork support to the bottom of the precast box girder using the fixing components. Lay reinforcing bars in the wet joint and pour concrete into the wet joint. S7: After the concrete has solidified, remove the fixing components. The second winding component drives the second wire rope to release the wire rope, and the first winding component drives the first wire rope to retract the wire rope, driving the formwork support into the discharge hopper and moving upward along the discharge hopper. S8: When one end of the formwork support moves upward and protrudes above the top of the discharge hopper, use hoisting machinery to lift the formwork support and remove the first wire rope from the formwork support. S9: After the formwork support has completely moved out of the discharge hopper, remove the second wire rope from the formwork support.

[0023] By adopting the above technical solution, when installing the bottom formwork, the formwork support is lowered along the hopper to below the wet joint using hoisting machinery. The formwork support is then lifted using the first and second steel wire ropes, bringing the bottom formwork into contact with the precast box girder. The formwork support is then fixed to the precast box girder using fixing components, completing the installation of the bottom formwork. When removing the bottom formwork, the fixing components are removed, and the formwork support is lowered using the first and second steel wire ropes, making the inclination angle of the formwork support close to the inclination angle of the hopper. The formwork support is then pulled into the hopper using the first steel wire rope and lifted along the hopper. Finally, the formwork support is pulled out of the hopper using hoisting machinery, completing the demolding. This eliminates the need to lift the bottom formwork from the ground below the bridge site using steel wire ropes, facilitating the installation and disassembly of the bottom formwork, especially in environments where the bridge site is below a river or ditch, thus facilitating the construction of the wet joint.

[0024] In summary, this application includes at least one of the following beneficial technical effects:

[0025] 1. The formwork support is first lowered along the hopper to the bottom of the precast box girder. Then, the formwork support is lifted by the first and second steel wire ropes, so that the bottom formwork is attached to the bottom of the precast box girder. The formwork support is then fixed to the bottom of the precast box girder by the fixing components, which facilitates the installation of the bottom formwork at the bottom of the wet joint. During demolding, the fixing components are removed, the second winding component releases the second steel wire rope, and the first winding component retracts the first steel wire rope, so that the formwork support rises along the hopper. The formwork support is then moved out by the hoisting machinery, which facilitates the recovery of the bottom formwork after demolding. This facilitates the installation and movement of the formwork, especially when there is a river or ditch under the bridge site, so that the formwork installation and disassembly operations can be carried out, which is convenient for wet joint construction operations.

[0026] 2. The material feeding rack and positioning rack are slidably installed on the guide rails at both ends of the precast box girder, which facilitates driving the material feeding rack and positioning rack to move on the precast box girder perpendicular to the length of the precast box girder. This makes it easier for the material feeding rack and positioning rack to move above multiple wet joints, which facilitates the construction operation of multiple wet joints.

[0027] 3. When the hanger rod is inserted vertically downwards into the through hole, it pushes the self-locking plates downwards, causing the gaps between the self-locking plates to widen. This allows the hanger rod to be smoothly inserted into the through hole. After concrete is poured onto the bottom formwork, the bottom formwork and the formwork support are subjected to force and tend to move downwards. At this time, under the action of the spring and friction, the self-locking plates tend to move upwards along the inner wall of the through hole, reducing the gaps between them. The self-locking plates then press the hanger rod tightly against the mounting block, thus fixing the formwork support in its current position. This prevents the formwork support and bottom formwork from moving downwards, which could cause concrete slurry to flow out from the gap between the bottom formwork and the precast box girder.

[0028] 4. The bottom mold is installed above the template support. If the bottom mold is damaged, it can be replaced. The template support can be reused, saving costs. Attached Figure Description

[0029] Figure 1 This is a structural schematic diagram of an embodiment of this application.

[0030] Figure 2 This is a schematic diagram illustrating the structure of the template support in the embodiments of this application.

[0031] Figure 3 This is a schematic diagram illustrating the structure of the feeding rack in the embodiments of this application.

[0032] Figure 4 This is a schematic diagram illustrating the structure of the positioning frame in the embodiments of this application.

[0033] Figure 5 This is a schematic diagram illustrating the structure of the fixed component in the embodiments of this application.

[0034] Figure 6 yes Figure 2 A sectional view of the middle template support after being sectioned along AA.

[0035] Figure 7 yes Figure 6 Enlarged view of section B in the middle.

[0036] Explanation of reference numerals in the attached figures:

[0037] 1. Bottom mold; 2. Template support; 3. Feeding rack; 31. Feeding hopper; 32. First winding assembly; 321. First winding reel; 322. First drive motor; 33. First wire rope; 34. Fixed pulley; 35. Counterweight; 4. Positioning frame; 41. Second winding assembly; 411. Second winding reel; 412. Second drive motor; 42. Second wire rope; 43. Support rod; 44. Guide wheel; 51. Hanging rod; 52. Suspension rod; 53. Self-locking component; 531. Mounting block; 532. Self-locking plate; 533. Spring; 534. Electromagnet; 6. Guide rail; 7. Through hole; 71. Slide groove; 72. Slider. Detailed Implementation

[0038] The following is in conjunction with the appendix Figure 1-7 This application will be described in further detail.

[0039] This application discloses a wet joint construction device, referring to... Figure 1 and Figure 2 A wet joint construction device includes a bottom formwork 1 and a formwork support 2. The bottom formwork 1 is a rectangular plate, and the formwork support 2 is a rectangular frame welded from multiple square steel tubes. Multiple reinforcing rods, also made of square tubing, are welded inside the formwork support 2 along its width. The bottom formwork 1 is covered and fixedly installed on one side surface of the formwork support 2, and lifting rings are installed at both ends of the formwork support 2.

[0040] A wet joint construction device also includes a material feeding frame 3, a positioning frame 4, and a fixing component, combined with Figure 3The feeding rack 3 is installed on top of the precast box girder and at one end of the precast box girder. A feeding hopper 31 is installed at an angle on the feeding rack 3, with the lowest angle of the feeding hopper 31 extending towards the bottom surface of the flange of the precast box girder and the highest angle extending away from the precast box girder. A first winding assembly 32 is installed on the feeding rack 3, and a first wire rope 33 is connected to the first winding assembly 32. The first winding assembly 32 is used to release or retract the first wire rope 33. One end of the first wire rope 33 is connected to the first winding assembly 32, and the other end enters the feeding hopper 31 from the top opening and connects to the lifting ring at the end of the template support 2. A positioning frame 4 is installed on the upper surface of the precast box girder and at the end of the precast box girder away from the feeding rack 3. A second winding assembly 41 is installed on the positioning frame 4, and a second wire rope 42 is connected to the second winding assembly 41. The second winding assembly 41 is used to release or retract the second wire rope 42. The second wire rope 42 is connected to a lifting lug on the template support 2 at the end opposite to the first wire rope 33. A fixing assembly is connected to the template support 2 and is used to firmly fix the template support 2 against the lower surface of two adjacent precast box girder flanges, thereby firmly fixing the bottom formwork 1 against the lower surface of the precast box girder flanges.

[0041] The distance between two piers of a bridge is called a span. A bridge may have multiple spans. Figure 1 The structure of only one span of the bridge is shown. Each span of the bridge is equipped with multiple precast box girders. The gap between the precast box girders of two adjacent spans of the bridge is small. The material hopper 31 is located between the precast box girders of two adjacent spans of the bridge, which makes it easy to lower the formwork support 2 from the gap between the precast box girders of two adjacent spans to the bottom of the wet joint.

[0042] When pouring the wet joint, the material feeding frame 3 is installed on the precast box girder and directly above the wet joint. The positioning frame 4 is installed at the other end of the precast box girder. The bottom formwork 1 is installed on the surface of the formwork support 2. The formwork support 2 is hoisted into the material feeding hopper 31 by hoisting machinery and lowered down along the material feeding hopper 31. The lowest inclined end of the formwork support 2 is connected to the second wire rope 42, and the highest inclined end of the formwork support 2 is connected to the first wire rope 33. After the formwork support 2 is lowered to the point where the highest inclined end is inside the material feeding hopper 31, the hoisting machinery is removed, and the first wire rope 33 is released through the first winding assembly 32. The formwork support 2 continues to be lowered down along the material feeding hopper 31. After the formwork support 2 is detached from the material feeding hopper 31, the formwork support 2 is lifted up until the bottom formwork 1 abuts against the lower surface of the flange of the precast box girder by retracting the first wire rope 33 and the second wire rope 42.

[0043] Reference Figure 3The first winding assembly 32 includes a first winding reel 321 and a first drive motor 322. The first winding reel 321 is rotatably mounted on the unloading rack 3, and the first drive motor 322 is mounted on the unloading rack 3. The output shaft of the first drive motor 322 is coaxially and fixedly connected to the first winding reel 321. A first wire rope 33 is wound around the first winding reel 321. A fixed pulley 34 is rotatably mounted at the highest inclined end of the unloading hopper 31 and on the side of the unloading hopper 31 facing the first winding reel 321. After the first wire rope 33 passes through the fixed pulley 34, it passes through the interior of the unloading hopper 31 and connects to the template support 2.

[0044] Reference Figure 4 The second winding assembly 41 includes a second winding reel 411 and a second drive motor 412. The second winding reel 411 is rotatably mounted on the positioning frame 4, and the second drive motor 412 is fixedly mounted on the positioning frame 4. A pulley is coaxially fixedly mounted on the output shaft of the second drive motor 412, and a pulley is also coaxially fixedly mounted on the second winding reel 411. A belt is wound around the two pulley supports. The second wire rope 42 is wound around the second winding reel 411. A support rod 43 is also installed on the positioning frame 4. The support rod 43 is inclined and extends away from the positioning frame 4. The end of the support rod 43 is located outside the precast box girder. A guide wheel 44 is rotatably mounted on the top of the support rod 43. The second wire rope 42 is wound around the guide wheel 44 and then connected to the template support 2.

[0045] The first drive motor 322 drives the first winding reel 321 to rotate, and the first winding reel 321 winds up or unwinds the first steel wire rope 33 wound on it; the second drive motor 412 drives the second winding reel 411 to rotate, and the second winding reel 411 winds up or unwinds the second steel wire rope 42 wound on it. Through the combined use of the first steel wire rope 33 and the second steel wire rope 42, the template support 2 can be lowered or raised along the inclined angle of the unloading hopper 31, and at the same time, the template support 2 can be raised until the bottom mold 1 abuts against the lower surface of the flange of the precast box girder.

[0046] In other embodiments, refer to Figure 3 and Figure 4 Two first wire reels 321 are coaxially fixedly installed on the feeding frame 3, and a first steel wire rope 33 is wound around each of the two first wire reels 321. Two fixed pulleys 34 are also rotatably installed on the feeding hopper 31. Two second wire reels 411 are also coaxially fixedly installed on the positioning frame 4, and a second steel wire rope 42 is wound around each of the two second wire reels 411. The two first steel wire ropes 33 and the two second steel wire ropes 42 synchronously lift or lower the template support 2. There are two support connection points at each end of the template support 2, which improves the stability of the template support 2 during movement and prevents the template support 2 from shifting or tipping over during movement.

[0047] Reference Figure 1 , Figure 3 and Figure 4 Guide rails 6 are installed on the upper surface of the precast box girder at both ends. The cross-sectional shape of the guide rails 6 is T-shaped, and the length direction of the guide rails 6 is perpendicular to the length direction of the precast box girder. The material feeding rack 3 and the positioning rack 4 are slidably installed on the guide rails 6. In order to ensure that the material feeding rack 3 and the positioning rack 4 are stably installed on the guide rails 6, two guide rails 6 are installed parallel to each other at both ends of the precast box girder.

[0048] Reference Figure 3 A counterweight 35 is installed on the feeding rack 3. The counterweight 35 and the feeding hopper 31 are located on the two sides of the guide rail 6, so that when the template support 2 moves along the feeding hopper 31, the center of gravity of the feeding rack 3 is located on the guide rail 6, thus preventing the feeding hopper 31 from tipping over.

[0049] After the construction of the wet joint between two adjacent precast box girders is completed, the material feeding frame 3 and the positioning frame 4 are moved along the guide rail 6 to the next wet joint to be constructed. This facilitates the construction of multiple wet joints on each span, shortens the time spent on disassembling, installing and moving the material feeding frame 3 and the positioning frame 4, and improves construction efficiency.

[0050] Reference Figure 1 and Figure 5 The fixing components include hanging rods 51, suspension rods 52, and self-locking components 53. The hanging rods 51 are steel pipes, and there are two hanging rods 51. Each hanging rod 51 is fitted with a clamp that matches the steel pipe, connecting the two hanging rods 51 in parallel. The two ends of each hanging rod 51 overlap two adjacent precast box girders. The suspension rods 52 are vertically inserted into the clamps and are installed at both ends of the hanging rods 51. The lower end of the suspension rods 52 vertically passes through the bottom formwork 1 and the reinforcing rods on the formwork support 2. The self-locking components 53 are installed inside the formwork support 2, and the suspension rods 52 connect with the self-locking components 53 when passing through the formwork support 2. The upper end of the hanger 52 is threaded. The hanger 52 is detachably mounted on the two hanging rods 51 via nuts. When the bottom mold 1 tends to move downwards, the self-locking member 53 blocks the hanger 52, thereby fixing the template support 2 to the hanger 52 via the self-locking member 53. The hanger 52 supports and fixes the bottom mold 1 and the template support 2. Multiple fixing components are provided along the length of the template support 2 at the wet joint.

[0051] Reference Figure 6 and Figure 7The self-locking component 53 includes a mounting block 531, a self-locking plate 532, a spring 533, and an electromagnet 534. The mounting block 531 is a rectangular block and is fixedly installed inside the reinforcing rod of the template support 2. A through hole 7 is formed vertically on the mounting block 531. The through hole 7 is a flared hole with a smaller upper end and a larger lower end. Multiple self-locking plates 532 are provided in the through hole 7. The self-locking plate 532 is a wedge-shaped block. The outer wall of the self-locking plate 532 fits against the outer wall of the through hole 7, and the inner wall of the self-locking plate 532 is arc-shaped and fits against the outer wall of the hanging rod 52. Multiple sliding grooves 71 are formed along the diameter direction on the side wall of the through hole 7. A slider 72 is provided on the outer wall of the self-locking plate 532. The cross-sectional shape of the slider 72 and the sliding groove 71 are both dovetail-shaped. The sliding groove 71 and the slider 72 are adapted to each other, thereby engaging and sliding the self-locking plate 532 on the inner wall of the through hole 7. A stop is provided on the inner wall of the bottom of the through hole 7. Multiple springs 533 are installed in the through hole 7, and each spring 533 corresponds to a self-locking piece 532. One end of the spring 533 is fixedly connected to the bottom of the self-locking piece 532, and the other end is fixedly connected to the stop at the bottom of the through hole 7. The spring 533 causes the self-locking piece 532 to always have an upward tendency. The self-locking piece 532 is made of magnetic metal, and the electromagnet 534 is embedded in the mounting block 531 and located at the bottom of the through hole 7.

[0052] After the formwork support 2 is raised into position, the hanging rod 51 is installed between the two precast box girders. The lifting rod 52 is then passed downward through the hanging rod 51. The lower end of the lifting rod 52 passes through the bottom formwork 1 and then through the through hole 7 into the formwork support 2. The upper end of the lifting rod 52 is fixed to the hanging rod 51 with a nut. When the lifting rod 52 is inserted vertically downward into the through hole 7, it pushes down multiple self-locking plates 532. The multiple self-locking plates 532 move downward along the slide groove 71. At the same time, under the action of the spring 533, the multiple self-locking plates 532 are always in contact with the lifting rod 52, and the gap between the multiple self-locking plates 532 tends to increase, allowing the lifting rod 52 to smoothly insert downward into the through hole 7. After concrete is poured on the bottom formwork 1, the bottom formwork 1 is subjected to downward pressure, and the formwork support 2 tends to move downward and bend downward. At this time, the mounting block 531 tends to move downward relative to the hanger 52, and the self-locking plate 532, under the action of the spring 533 and the friction between itself and the hanger 52, tends to move upward along the slide groove 71. The gap between the multiple self-locking plates 532 decreases, and the multiple self-locking plates 532 clamp and fix the hanger 52 in the mounting block 531. Thus, the formwork support 2 is fixed to the hanger 52 by the friction between the self-locking plates 532 and the hanger 52, achieving the effect of supporting and fixing the formwork support 2. After the concrete solidifies, the electromagnet 534 is activated. The electromagnet 534 attracts the multiple self-locking plates 532 and drives the multiple self-locking plates 532 to move downward along the slide groove 71. The gap between the multiple self-locking plates 532 widens, and the hanger 52 is pulled out from the formwork support 2.

[0053] The implementation principle of a wet joint construction device according to an embodiment of this application is as follows: The bottom formwork 1 is fixedly installed on the surface of the formwork support 2. The formwork support 2 is lowered at an incline along the material hopper 31 to the bottom of the wet joint by a hoisting machine. The first wire rope 33 and the second wire rope 42 are wound up to lift the formwork support 2 so that the bottom formwork 1 is in contact with the bottom surface of the flange of the precast box girder. The two ends of the hanging rod 51 are overlapped on two adjacent precast box girders. The hanging rod 52 is vertically inserted into the hanging rod 51. The hanging rod 52 passes vertically through the through hole 7 on the bottom formwork 1 and the formwork support 2. The self-locking part 53 fixes the formwork support 2 to the hanging rod 52. The formwork support 2 is fixedly supported by the hanging rod 52.

[0054] This application also discloses a method for constructing wet joints, which specifically includes the following steps:

[0055] S1: Lay the bottom formwork 1 and fix it on the formwork support 2. Install guide rails 6 on both ends of the precast box girder and install the material feeding rack 3 and the positioning rack 4 on the guide rails 6 at both ends respectively.

[0056] S2: The template support 2 is lowered into the hopper 31 from the top using hoisting machinery. After the lower end of the template support 2 passes through the bottom opening of the hopper 31, the second wire rope 42 is connected to the lower end of the template support 2.

[0057] S3: Continue to lower the template support 2 using the hoist. At this time, the second reel 411 adjusts the second rope so that the template support 2 is lowered along the inclination angle of the hopper 31. When the top of the template support 2 is inside the hopper 31, connect the first wire rope 33 to the top of the template support 2 and then remove the hoisting machinery.

[0058] S4: The first reel 321 performs a wire feeding operation on the first wire rope 33, and lowers the template support 2 until the template support 2 is separated from the feeding hopper 31;

[0059] S5: The first reel 321 winds up the first wire rope 33, and the second reel 411 winds up the second wire rope 42, raising the template support 2 until the bottom formwork 1 is in contact with the bottom surface of the precast box girder flange;

[0060] S6: Install the hanging rod 51 between two adjacent precast box girders, and vertically install the hanging rod 52 on the hanging rod 51. The lower end of the hanging rod 52 passes vertically through the bottom formwork 1 and then through the through hole 7 through the formwork support 2. The self-locking piece 532 abuts and fixes the formwork support 2 to the hanging rod 52.

[0061] S7: Lay steel bars in the wet joint and pour concrete into the wet joint;

[0062] S8: After the concrete has solidified, start the electromagnet 534, pull out the lifting rod 52, remove the hanging rod 51, the first reel 321 releases the first wire rope 33, the second reel 411 releases the second wire rope 42, lower the formwork support 2, and make the formwork support 2 tilted at the same angle as the feeding hopper 31, with the highest tilt of the formwork support 2 close to the feeding hopper 31 and the lowest tilt away from the feeding hopper 31;

[0063] S9: The first winding wheel 321 drives the first wire rope 33 to wind up, drives the template support 2 to enter the feeding hopper 31 from the lower opening of the feeding hopper 31, and drives the template support 2 to rise along the feeding hopper 31. During the lifting process of the template support 2, the second winding wheel 411 adjusts the length of the second wire rope 42 so that the template support 2 always maintains the same tilt angle with the feeding hopper 31 when it is lifted.

[0064] S10: When the template support 2 is raised to the top and aligned with the top opening of the discharge hopper 31, connect the hoisting machinery to the top of the template support 2, remove the first wire rope 33 from the template support 2, and continue to raise the template support 2 through the hoisting machinery. During the raising process, the second reel 411 adjusts the length of the second wire rope 42 so that the template support 2 always maintains the same tilt angle with the discharge hopper 31 when it is raised.

[0065] S11: After the hoisting machinery lifts the template support 2 to the point of being detached from the discharge hopper 31, the second wire rope 42 is removed from the template support 2;

[0066] S12: Move the material feeding frame 3 and the positioning frame 4 along the guide rail 6, and repeat the above operation to construct other wet joints on the same span of the bridge.

[0067] Finally, it should be noted that in the description of this application, the terms "vertical," "upper," "lower," "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0068] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A wet joint construction apparatus comprising a base mould (1), characterised in that, Also include: The bottom die (1) is laid on the formwork support (2); The discharge rack (3) is provided at one end of the precast box girder, and the discharge rack (3) is provided with a discharge hopper (31) for the formwork support (2) to pass through. The first winding assembly (32) is provided on the discharge rack (3), the first steel wire rope (33) is provided on the first winding assembly (32), the first winding assembly (32) is used for paying out or retracting the first steel wire rope (33), and the first steel wire rope (33) enters the discharge hopper (31) from the top of the discharge hopper (31) and is connected with one end of the formwork support (2); The positioning frame (4) is provided at the end of the precast box girder away from the discharge rack (3), the second winding assembly (41) is provided on the positioning frame (4), the second steel wire rope (42) is connected with the second winding assembly (41), the second winding assembly (41) is used for paying out or retracting the second steel wire rope (42), and the second steel wire rope (42) is connected with the other end of the formwork support (2); The fixing assembly is connected with the formwork support (2) and is used for tightly fixing the formwork support (2) on the bottom of the precast box girder.

2. A wet seam construction apparatus according to claim 1, wherein: The first winding assembly (32) comprises a first wire winding wheel (321) and a first driving motor (322), the first wire winding wheel (321) is coaxially arranged on the output shaft of the first driving motor (322), the first steel wire rope (33) is wound on the first wire winding wheel (321), and the discharge hopper (31) top is rotatably provided with a fixed pulley (34). The first steel wire rope (33) extends to the discharge hopper (31) after winding through the fixed pulley (34).

3. A wet seam construction apparatus as defined in claim 1, wherein: The second winding assembly (41) comprises a second wire winding wheel (411) and a second driving motor (412), the second wire winding wheel (411) is rotatably arranged on the positioning frame (4), and the second driving motor (412) is connected with the second wire winding wheel (411) and is used for driving the second wire winding wheel (411) to rotate.

4. A wet seam construction apparatus as defined in claim 1, wherein: The precast box girder is provided with guide rails (6) at both ends, the length direction of the guide rail (6) is perpendicular to the length direction of the precast box girder, and the discharge rack (3) and the positioning frame (4) are respectively slidably arranged on the guide rails (6) at both ends of the precast box girder.

5. A wet seam construction apparatus according to claim 4, wherein: The discharge rack (3) is provided with a counterweight (35), and the counterweight (35) and the discharge hopper (31) are located on both sides of the guide rail (6) respectively.

6. A wet seam construction apparatus as defined in claim 1, wherein: The fixing assembly comprises a hanging rod (51), a suspender (52) and a self-locking piece (53), both ends of the hanging rod (51) are respectively arranged on two adjacent precast box girders, the self-locking piece (53) is arranged on the formwork support (2), one end of the suspender (52) is detachably connected with the hanging rod (51), the other end of the suspender (52) vertically penetrates the bottom die (1) and is connected with the self-locking piece (53), and when the bottom die (1) has a downward movement trend, the self-locking piece (53) blocks the suspender (52).

7. A wet seam construction apparatus according to claim 6, wherein: The self-locking piece (53) comprises a mounting block (531), a self-locking sheet (532), a spring (533) and an electromagnet (534), the mounting block (531) is arranged in the formwork support (2), a through hole (7) with a small upper end and a large lower end is formed in the mounting block (531), a sliding groove (71) is arranged on the side wall of the through hole (7), the self-locking sheet (532) is arranged in the sliding groove (71) in a clamped and sliding manner, a plurality of self-locking sheets (532) are arranged on the side wall of the through hole (7), the boom (52) is vertically inserted into the through hole (7), the side of the self-locking sheet (532) facing the boom (52) is attached to the boom (52), the spring (533) is arranged on the side wall of the through hole (7), one end of the spring (533) is connected with the self-locking sheet (532), and the other end of the spring (533) is connected with the mounting block (531), the spring (533) enables the self-locking sheet (532) to always have a tendency to move upward, and the electromagnet (534) is arranged at the bottom of the mounting block (531).

8. A method of wet joint construction using the wet joint construction apparatus according to any one of claims 1 to 7, characterized by, The method comprises the following steps: S1: the bottom die (1) is laid and arranged on the formwork support (2), and the feeding rack (3) and the positioning rack (4) are respectively arranged at two ends of the precast box girder; S2: the formwork support (2) is placed into the feeding hopper (31) from the top by hoisting machinery, and the second steel wire rope (42) is connected to one end of the formwork support (2) located below; S3: the formwork support (2) is continuously placed down, when the top of the formwork support (2) is located in the feeding hopper (31), the first steel wire rope (33) is connected to the top end of the formwork support (2), the hoisting machinery is removed, the first steel wire rope (33) is unwound, and the formwork support (2) is driven to be placed down to be separated from the feeding hopper (31); S4: the first steel wire rope (33) and the second steel wire rope (42) are wound, and the formwork support (2) is driven to be lifted to be attached to the bottom of the precast box girder; S5: the formwork support (2) is tightly fixed on the bottom of the precast box girder by the fixing assembly, the steel bars are laid in the wet joint, and the concrete is poured into the wet joint; S6: after the concrete is solidified, the fixing assembly is removed, the second steel wire rope (42) is unwound by the second winding assembly (41), the first steel wire rope (33) is wound by the first winding assembly (32), and the formwork support (2) is driven to enter the feeding hopper (31) and move upwards along the feeding hopper (31); S7: when one end of the formwork support (2) moves upwards to protrude from the top of the feeding hopper (31), the formwork support (2) is lifted by the hoisting machinery, and the first steel wire rope (33) is removed from the formwork support (2); S8: after the formwork support (2) completely moves out of the feeding hopper (31), the second steel wire rope (42) is removed from the formwork support (2).

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