A retractable formwork support system for precasting of box girder

Abstract

The application relates to a retractable inner mold support system for box girder prefabrication and relates to the technical field of box girders, which comprises a bottom mold, two side molds, a top mold and two connecting molds, the two side molds are respectively located on the top of the two sides of the bottom mold, the top mold is located above the bottom mold, the two connecting molds are respectively located at the ends of the two side molds away from the bottom mold, a lifting plate is arranged above the bottom mold, recesses are arranged at the two ends of two sides of the lifting plate, connecting rods are hingedly connected to the two ends of the two sides of the lifting plate, and push blocks are hingedly connected to the ends of the connecting rods away from the lifting plate. The application solves the problem that when workers remove a plurality of steel formworks or wood formworks, they need to work in a narrow space inside the box girder, which may cause the formwork to deform, affect the subsequent reuse, damage the corners of the concrete inner wall, damage the appearance quality and structural integrity of the box girder, increase the later repair cost, and also bring certain risks to the safety of the construction personnel in the closed space operation.

Description

Technical Field

[0001] This application relates to box girders, and more particularly to a retractable internal formwork support system for the prefabrication of box girders. Background Technology

[0002] Precast box girders are key structural components widely used in modern bridge construction. They are formed by factory prefabrication or on-site casting and play an important role in transportation engineering such as highways and railways due to their high strength and large span. The structural feature of box girders is that their cross-section is box-shaped and contains a cavity. The formation of this cavity depends on the support and shaping of the inner mold. In the existing technology, the inner mold is usually composed of multiple steel or wooden templates assembled inside the box girder's reinforcement cage. Each template is fixed in position by complex support rods, which together form the outline of the box girder's internal cavity, including key parts such as the inner wall of the web and the bottom surface of the top plate. This provides the necessary forming space for concrete pouring and ensures that the box girder forms a box-shaped structure that meets the design requirements after hardening.

[0003] In existing technologies, traditional internal formwork is usually assembled from multiple steel or wooden formwork panels inside the box girder reinforcement cage. After the concrete is poured and reaches a certain strength, the internal formwork needs to be removed to complete the prefabrication process of the box girder. However, the current formwork removal method requires sending personnel into the box girder to loosen the formwork section by section from the outside to the inside and then pull it out. This process is not only cumbersome and inefficient, but also poses many hidden dangers. For example, when workers are working in the confined space inside the box girder, they need to use tools such as crowbars to pry it, which can easily cause the formwork to deform and affect its subsequent reuse. At the same time, violent dismantling may damage the edges and corners of the concrete inner wall, destroy the appearance quality and structural integrity of the box girder, increase the cost of later repairs, and working in a confined space also poses certain safety risks to construction workers. Utility Model Content

[0004] The purpose of this application is to provide a retractable internal formwork support system for precast box girders, which has the advantages of easy disassembly. It solves the problem that when workers dismantle multiple steel or wooden formworks, they need to work in a confined space inside the box girder, which may cause the formwork to deform, affecting subsequent reuse, damaging the edges of the concrete inner wall, destroying the appearance quality and structural integrity of the box girder, increasing the cost of later repairs, and the confined space operation also poses certain safety risks to construction workers.

[0005] This application provides a retractable internal formwork support system for box girder prefabrication, which adopts the following technical solution: it includes a bottom formwork, two side formworks, a top formwork, and two connecting formworks. The two side formworks are located on the top two sides of the bottom formwork, and the top formwork is located above the bottom formwork. The two connecting formworks are located at the ends of the two side formworks away from the bottom formwork. A lifting plate is provided above the bottom formwork. Grooves are provided at both ends of one side of the lifting plate and connecting rods are hinged to them. A push block is hinged to the end of the connecting rod away from the lifting plate. The side formwork is fixedly connected to the side of the push block away from the connecting rod. A plurality of first push rods are fixedly connected to the upper surface of the lifting plate. The top formwork is fixedly connected to the end of the first push rod away from the lifting plate. A second push rod is fixedly connected inside the connecting formwork. By adopting the above technical solution, when the concrete solidifies and the device is dismantled, the lifting plate can be lowered. After the lifting plate is lowered, the top formwork can be lowered by the top rod, and the side formwork can be moved by the connecting rod, so that both the top formwork and the side formwork are separated from the concrete. The second top rod can move the connecting formwork, so that the connecting formwork is separated from the concrete. This device can automatically complete the formwork dismantling process without manual entry into the box girder. It solves the problem that when workers dismantle multiple steel or wooden formwork, they need to work in the narrow space inside the box girder, which may cause the formwork to deform, affect subsequent reuse, damage the edges of the inner wall of the concrete, damage the appearance quality and structural integrity of the box girder, increase the cost of later repairs, and the confined space operation also poses certain safety risks to construction workers.

[0006] Preferably, a slide rail is fixedly connected to the upper surface of the bottom mold, and the side mold is located outside the slide rail and slidably connected to the slide rail; By adopting the above technical solution, the slide rail side mold is limited, so that the side mold can only slide parallel above the bottom mold.

[0007] Preferably, a plurality of first hydraulic rods are fixedly connected to the upper surface of the bottom mold, and the output shafts of the first hydraulic rods are fixedly connected to the lifting plate; By adopting the above technical solution, the first hydraulic rod can provide power to the lifting plate, enabling the lifting plate to move up and down.

[0008] Preferably, a fixing block is fixedly connected to the upper surface of the bottom mold, and two second hydraulic rods are fixedly connected inside the fixing block. The output shafts of the two second hydraulic rods are respectively fixedly connected to two second push rods. By adopting the above technical solution, the fixing block can support and fix the second hydraulic rod in an inclined state, and the second hydraulic rod can provide power to the second ejector rod, so that the second ejector rod drives the connecting mold to move.

[0009] Preferably, support blocks are fixedly connected to the four corners of the upper surface of the bottom mold, rotating blocks are rotatably connected inside the support blocks, and rotating rods are fixedly connected between two adjacent rotating blocks. The rotating rods are located inside the support blocks and rotatably connected to the support blocks. By adopting the above technical solution, the support block can support the rotating block, and the rotating rod can connect two adjacent rotating blocks, so that the two adjacent rotating blocks can rotate synchronously.

[0010] Preferably, a roller is rotatably connected to the end of the rotating block away from the support block, and movable holes adapted to the rollers are opened at the four corners of the bottom mold; By adopting the above technical solution, the roller can enter the interior of the movable hole and come into contact with the concrete, thereby fixing the bottom formwork and allowing the bottom formwork to move above the concrete.

[0011] Preferably, two third hydraulic rods are fixedly connected to the upper surface of the bottom mold, and a movable plate is fixedly connected to the output shaft of the third hydraulic rods; By adopting the above technical solution, the third hydraulic rod can provide power to the moving plate, enabling the moving plate to move.

[0012] Preferably, a rack is fixedly connected to the side of the movable plate away from the third hydraulic rod, and a gear is fixedly connected to the outer side of the rotating rod, with the two racks respectively meshing with the two gears; By adopting the above technical solution, the third hydraulic rod can move the rack after moving the moving plate, and the rack can drive the rotating rod to rotate after moving.

[0013] In summary, this application includes at least one of the following beneficial technical effects: 1. This retractable internal formwork support system for precast box girders, through the arrangement of bottom formwork, side formwork, top formwork, connecting formwork, slide rail, lifting plate, first hydraulic rod, connecting rod, push block, first top rod, second hydraulic rod, and second top rod, allows the device to automatically complete the formwork disassembly process without manual entry into the box girder. This solves the problems of workers having to work in the confined space inside the box girder when disassembling multiple steel or wooden formwork panels, which may cause formwork deformation, affect subsequent reuse, damage the edges of the concrete inner wall, compromise the appearance quality and structural integrity of the box girder, increase later repair costs, and pose certain safety risks to construction workers when working in confined spaces.

[0014] 2. This retractable internal formwork support system for box girder prefabrication, through the arrangement of rotating blocks, rollers, rotating rods, gears, a third hydraulic rod, a movable plate, a rack, and movable holes, allows the device to be used in the event of use. The third hydraulic rod causes the movable plate to move the rack, which in turn causes the gear to rotate the rotating rod. This causes the rotating block to change the position of the rollers, allowing them to enter the movable hole and contact the concrete below the bottom formwork. Workers can then directly pull the device using external equipment, easily removing it as a whole and improving the demolding efficiency. Attached Figure Description

[0015] Figure 1 This is a schematic axial sectional view of this application; Figure 2 This is an axial view schematic diagram of the bottom mold of this application; Figure 3 This is a schematic top-view cross-section of this application; Figure 4 This is a schematic side-axis sectional view of this application; Figure 5 For the purposes of this application Figure 4 Enlarged diagram of point A.

[0016] In the picture: 1. Bottom mold; 2. Side mold; 3. Top mold; 4. Connecting mold; 5. Slide rail; 6. Lifting plate; 7. First hydraulic rod; 8. Connecting rod; 9. Push block; 10. First ejector rod; 11. Fixed block; 12. Second hydraulic rod; 13. Second ejector rod; 14. Support block; 15. Rotating block; 16. Roller; 17. Rotating rod; 18. Gear; 19. Third hydraulic rod; 20. Moving plate; 21. Rack; 22. Movable hole. Detailed Implementation

[0017] The following is in conjunction with the appendix Figure 1 - Appendix Figure 5 This application will be described in further detail below.

[0018] Example 1: A retractable internal formwork support system for box girder prefabrication, referring to... Figure 1 , Figure 2 , Figure 3 , Figure 4The system includes a bottom mold 1, two side molds 2, a top mold 3, and two connecting molds 4. The two side molds 2 are located on the top sides of the bottom mold 1, and the top mold 3 is located above the bottom mold 1. The two connecting molds 4 are located at the ends of the two side molds 2 away from the bottom mold 1. A lifting plate 6 is provided above the bottom mold 1. Grooves are provided at both ends of one side of the lifting plate 6 and are hinged to connecting rods 8. A push block 9 is hinged to the end of the connecting rod 8 away from the lifting plate 6. The side mold 2 is fixedly connected to the side of the push block 9 away from the connecting rod 8. Several [unclear - possibly referring to a specific type of component] are fixedly connected to the upper surface of the lifting plate 6. A first ejector rod 10 is fixedly connected to the top mold 3 at one end away from the lifting plate 6. A second ejector rod 13 is fixedly connected inside the connecting mold 4. A slide rail 5 is fixedly connected to the upper surface of the bottom mold 1. The side mold 2 is located outside the slide rail 5 and is slidably connected to the slide rail 5. Several first hydraulic rods 7 are fixedly connected to the upper surface of the bottom mold 1. The output shaft of the first hydraulic rods 7 is fixedly connected to the lifting plate 6. A fixing block 11 is fixedly connected to the upper surface of the bottom mold 1. Two second hydraulic rods 12 are fixedly connected inside the fixing block 11. The output shaft of 12 is fixedly connected to two second top rods 13. Through the arrangement of bottom mold 1, side mold 2, top mold 3, connecting mold 4, slide rail 5, lifting plate 6, first hydraulic rod 7, connecting rod 8, push block 9, first top rod 10, second hydraulic rod 12, and second top rod 13, when the concrete solidifies and the device is disassembled, the lifting plate 6 can be lowered through the first hydraulic rod 7. After the lifting plate 6 is lowered, the top mold 3 can be lowered through the top rod, and the side mold 2 can be moved through the connecting rod 8, so that the top mold 3 and the side mold 2 are separated from the concrete. The second hydraulic rod 12 can move the connecting mold 4, so that the connecting mold 4 is separated from the concrete. This device can automatically complete the formwork disassembly process without manual entry into the box girder. It solves the problem that when workers disassemble multiple steel or wooden formwork, they need to work in the narrow space inside the box girder, which may cause the formwork to deform, affect subsequent reuse, damage the edges of the inner wall of the concrete, damage the appearance quality and structural integrity of the box girder, increase the cost of later repairs, and the confined space operation also poses certain safety risks to construction workers.

[0019] Example 2: A retractable internal formwork support system for box girder prefabrication, referring to... Figure 4 , Figure 5Support blocks 14 are fixedly connected to the four corners of the upper surface of the bottom mold 1. Rotating blocks 15 are rotatably connected inside the support blocks 14. Rotating rods 17 are fixedly connected between two adjacent rotating blocks 15. The rotating rods 17 are located inside the support blocks 14 and rotatably connected to the support blocks 14. A roller 16 is rotatably connected to the end of the rotating block 15 away from the support block 14. Movable holes 22 that are adapted to the rollers 16 are opened at the four corners of the bottom mold 1. Two third hydraulic rods 19 are fixedly connected to the upper surface of the bottom mold 1. A moving plate 20 is fixedly connected to the output shaft of the third hydraulic rod 19. A rack 21 is fixedly connected to the side of the moving plate 20 away from the third hydraulic rod 19. A gear 18 is fixedly connected to the outer side of the rotating rod 17. Two racks 21 are respectively meshed with two gears 18. Through the arrangement of the rotating block 15, roller 16, rotating rod 17, gear 18, third hydraulic rod 19, moving plate 20, rack 21 and movable hole 22, when the device is in use, the moving plate 20 can be driven by the third hydraulic rod 19 to move the rack 21. After the rack 21 moves, the gear 18 can drive the rotating rod 17 to rotate, thereby changing the position of the rotating block 15, so that the roller 16 enters the interior of the movable hole 22 and contacts the concrete under the bottom mold 1. This allows the worker to directly pull the device with external equipment, so that the device can be easily pulled out as a whole, improving the demolding efficiency of the device.

[0020] The implementation principle of this application embodiment is as follows: In use, two side molds 2 are located on both sides of the bottom mold 1, and the top mold 3 is located above the side molds 2. Two connecting molds 4 respectively contact the two side molds 2 and the two sides of the top mold 3, thereby forming a cavity for the prefabrication of the concrete box girder. After the concrete is poured and solidified, the operator is located outside and remotely activates the first hydraulic rod 7. After the first hydraulic rod 7 is activated, the lifting plate 6 is lowered. After the lifting plate 6 is lowered, the top mold 3 is lowered along with the lifting plate 6 through the first push rod 10. When the lifting plate 6 is lowered, the lifting plate 6 pulls the connecting rod 8, and the connecting rod 8 pulls the push block 9. After the push block 9 moves, the side mold 2 slides on the outside of the slide rail 5, thereby separating the top mold 3 and the side mold 2 from the concrete. Then, the second hydraulic rod 12 is activated, and the second hydraulic rod 12 causes the second push rod to... The second top rod 13 moves, causing the connecting mold 4 to move and separate from the concrete. Then, the user activates the third hydraulic rod 19, which moves the moving plate 20. The moving plate 20 moves the rack 21, which in turn rotates the gear 18. The gear 18 then rotates the rotating rod 17, which in turn rotates the rotating block 15. The rotating block 15 then moves the roller 16, causing it to move into the movable hole 22. After moving, the roller 16 contacts the concrete and supports the bottom mold 1, causing it to rise slightly and separate from the concrete. The worker can then fix the rope to the device and use external equipment to wind up the rope, thereby pulling the device to move and demold the concrete.

Claims

1. A retractable internal formwork support system for box girder prefabrication, comprising a bottom formwork (1), two side formworks (2), a top formwork (3), and two connecting formworks (4), characterized in that: The two side molds (2) are located on the top two sides of the bottom mold (1), the top mold (3) is located above the bottom mold (1), the two connecting molds (4) are located at the ends of the two side molds (2) away from the bottom mold (1), a lifting plate (6) is provided above the bottom mold (1), the two ends of the lifting plate (6) are provided with grooves and are hinged to connecting rods (8), the end of the connecting rod (8) away from the lifting plate (6) is hinged to a push block (9), the side of the push block (9) away from the connecting rod (8) is fixedly connected to the side mold (2), a number of first push rods (10) are fixedly connected to the upper surface of the lifting plate (6), the end of the first push rod (10) away from the lifting plate (6) is fixedly connected to the top mold (3), and the inside of the connecting mold (4) is fixedly connected to a second push rod (13).

2. The retractable internal formwork support system for box girder prefabrication according to claim 1, characterized in that: The upper surface of the bottom mold (1) is fixedly connected to a slide rail (5), and the side mold (2) is located outside the slide rail (5) and is slidably connected to the slide rail (5).

3. The retractable internal formwork support system for box girder prefabrication according to claim 1, characterized in that: The upper surface of the bottom mold (1) is fixedly connected with several first hydraulic rods (7), and the output shaft of the first hydraulic rods (7) is fixedly connected to the lifting plate (6).

4. A retractable internal formwork support system for box girder prefabrication according to claim 1, characterized in that: A fixing block (11) is fixedly connected to the upper surface of the bottom mold (1). Two second hydraulic rods (12) are fixedly connected inside the fixing block (11). The output shafts of the two second hydraulic rods (12) are fixedly connected to two second push rods (13).

5. A retractable internal formwork support system for box girder prefabrication according to claim 1, characterized in that: Support blocks (14) are fixedly connected to the four corners of the upper surface of the bottom mold (1). Rotating blocks (15) are rotatably connected inside the support blocks (14). Rotating rods (17) are fixedly connected between two adjacent rotating blocks (15). The rotating rods (17) are located inside the support blocks (14) and are rotatably connected to the support blocks (14).

6. A retractable internal formwork support system for box girder prefabrication according to claim 5, characterized in that: The end of the rotating block (15) away from the support block (14) is rotatably connected to a roller (16), and the four corners of the bottom mold (1) are provided with movable holes (22) that are adapted to the roller (16).

7. A retractable internal formwork support system for box girder prefabrication according to claim 6, characterized in that: Two third hydraulic rods (19) are fixedly connected to the upper surface of the bottom mold (1), and the output shaft of the third hydraulic rods (19) is fixedly connected to a moving plate (20).

8. A retractable internal formwork support system for box girder prefabrication according to claim 7, characterized in that: A rack (21) is fixedly connected to the side of the movable plate (20) away from the third hydraulic rod (19), and a gear (18) is fixedly connected to the outer side of the rotating rod (17). The two racks (21) are respectively meshed with the two gears (18).

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