A precast box girder formwork that is easy to assemble and disassemble and has a stable connection

Abstract

This invention discloses a precast box girder template that is easy to assemble and disassemble and has a stable connection, relating to the field of precast box girder casting technology for bridges. It includes a main assembly comprising a module unit, a reinforcing support unit, and an auxiliary sealing unit. The module unit includes a side mold, an inner mold, an adjustable support template, a bottom plate, and a support base frame. This invention utilizes screws to install all components connected to the adjustable support template in the adjustable support assembly, along with hanging plates and bow-shaped limiting frames, facilitating assembly and disassembly. The support provided by the fitting support arc plate and reinforcing plate on one end of the adjustable support template enhances its structural strength. The use of rubber sealing arc blocks and insert strips, as well as the connection between the convex plate and the adjustable support template, improves the sealing performance after molding, preventing cement leakage and thus improving the quality of the finished precast box girder.

Description

Technical Field

[0001] This invention relates to the field of precast box girder casting technology for bridges, specifically to a precast box girder template that is easy to assemble and disassemble and has a stable connection. Background Technology

[0002] A box girder is a type of beam used in bridge engineering. It is hollow inside with flanges on both sides of the upper part, resembling a box, hence its name. Types include single-box and multi-box girders. Reinforced concrete box girders are a crucial structure in bridge engineering, and based on the concrete pouring method, they are divided into precast box girders and cast-in-place box girders. Cast-in-place box girders are cast directly on the construction site. Precast box girders are prefabricated in a separate site and then hoisted into place after the bridge substructure is completed. Because precast box girders effectively avoid construction overlap and interference, significantly improving project progress and saving time, they are widely used.

[0003] Common formwork solutions for casting precast box girders include wooden formwork, ordinary combined steel formwork, and custom-made steel formwork. Wooden formwork is simple and flexible, but it suffers from poor rigidity, limited reuse, numerous misalignments and joints, low assembly and disassembly efficiency, and compromised concrete appearance quality, making it only suitable for small bridge projects with lower requirements. Ordinary combined steel formwork, while having higher rigidity than wooden formwork, requires the combination of various sizes, making assembly difficult and resulting in low assembly and disassembly efficiency, numerous joints, and compromised concrete appearance quality, making it unsuitable for large bridge projects with short construction periods. While standardized steel formwork has a higher initial investment, it offers good overall integrity and rigidity, and its assembly and disassembly can be mechanically assisted, significantly improving construction efficiency. Therefore, standardized steel formwork is the most frequently used solution in actual precast box girder construction.

[0004] Existing standardized steel formwork includes side forms, inner forms, and supporting components. When using standardized steel formwork for pouring concrete, construction workers first tie the bottom slab reinforcement, then tie the web reinforcement and thread corrugated pipes. The side and inner forms of the box girder are then erected, and after inspection by the supervising engineer, the top slab reinforcement is tied. The top slab reinforcement is constructed using a plumb line to ensure neat and consistent reinforcement. Finally, the concrete is poured, and after pouring is complete, the inner and side forms are removed sequentially.

[0005] However, the standard steel formwork used in existing technologies uses ordinary steel formwork, which is extremely prone to rust. The rust removal work increases the construction time for each box girder. In addition, after the box girder reinforcement and formwork are installed, but before the top slab reinforcement is tied and concrete is poured, the ordinary steel formwork will rust again. At this time, it is impossible to remove the rust again. Therefore, the outer surface of the box girder poured using the standard steel formwork in existing technologies is uneven and has a poor appearance.

[0006] The prior art proposes a Chinese patent with publication number CN105014774A to solve the aforementioned technical problems. The technical solution disclosed in this patent document is as follows: A precast box girder formwork includes a side mold, an inner mold, and a support system; the side mold includes ordinary steel formwork and a stainless steel plate; the cross-section of both the ordinary steel formwork and the stainless steel plate is U-shaped; the stainless steel plate is set on the ordinary steel formwork; the cross-section of the inner mold is annular; the inner mold is set inside the side mold; the support system is set outside the ordinary steel formwork for supporting the side mold. The precast box girder formwork provided by this invention, by setting a stainless steel plate on the ordinary steel formwork of the side mold, avoids the problem of unevenness on the outer surface of the cast box girder caused by rusting of the ordinary steel formwork during the casting process, making the outer surface of the box girder smooth and aesthetically pleasing.

[0007] The above technical solution will have the following problems in actual use:

[0008] While this existing technology can avoid the problem of unevenness on the outer surface of the cast box girder caused by rust during the casting process of ordinary steel formwork, making the outer surface of the box girder smooth and beautiful, its overall structure is inconvenient to install and disassemble. Moreover, when it is reused for a short period of time, it is necessary to completely disassemble and reassemble it in order to complete the disassembly of the precast box girder. Summary of the Invention

[0009] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows:

[0010] A precast box girder formwork that is easy to assemble and disassemble and has a stable connection includes a main device, which includes a module unit, a reinforcing support unit and an auxiliary sealing unit.

[0011] The module unit includes a side mold, an inner mold, an adjustable support template, a base plate, and a support base frame. The reinforcement support unit includes an adjustable support assembly and an auxiliary support column for supporting and adjusting the adjustable support template. The auxiliary sealing unit includes a rubber sealing arc block and a plug strip.

[0012] The adjustable support assembly includes a bearing plate, a side mounting bracket, a fitting support arc plate, a reinforcing plate, and an arch-shaped limiting bracket. One end of the support base frame has a bearing groove for engaging the bearing plate, and one end of the rubber sealing arc block has an arc block fitting groove for engaging the insert strip. The adjustable support assembly is located on the right side of the adjustable support template, and the side mold is located on the back of the adjustable support template.

[0013] A further improvement of the technical solution of the present invention is that: a hanging plate is fixedly connected to one side of the adjusting support template near the adjusting support assembly, the inner wall of the hanging plate is engaged with the outer wall of one end of the side mounting bracket, and the upper surface of the bow-shaped limiting bracket is fixedly connected to the bottom surface of one end of the adjusting support template.

[0014] In the above technical solution, all components connected to the adjusting support template in the adjusting support assembly are installed with screws. In addition, the use of hanging plates and bow-shaped limiting frames facilitates assembly and disassembly. Furthermore, the support provided by the fitting support arc plate and reinforcing plate on the bottom side of one end of the adjusting support template improves the structural strength of the adjusting support template.

[0015] A further improvement of the technical solution of the present invention is that: an upper support rod is rotatably connected to the top of the auxiliary support column, a clamping plate shaft is rotatably connected to the top of the upper support rod, the top of the clamping plate shaft is fixedly connected to the bottom of one end of the adjusting support template by screws, an external support arc plate is fixedly connected to the outer wall of the upper support rod, and the bottom end of the external support arc plate is movably connected to the top of the auxiliary support column.

[0016] By adopting the above technical solution, the auxiliary support column, bearing plate, upper support rod and external support arc plate are used in combination to enable the upper support rod to form an integral part with the auxiliary support column after the adjustment support template is closed, so as to support the adjustment support template and further improve the stability of the adjustment support template.

[0017] A further improvement of the technical solution of the present invention is that: the bottom end of the auxiliary support column is rotatably connected to the upper surface of the bearing plate, the outer wall of the bottom end of the bearing plate is engaged with the inner wall of the bearing slot, a hanging ring is fixedly connected to the front of the side mold, and a lateral limiting hanging rod is engaged with the inner wall of the hanging ring.

[0018] A further improvement of the technical solution of the present invention is that: the center of the side of the side mounting bracket away from the adjustment support template is rotatably connected to the top of the adjustment cylinder, and the bottom of the adjustment cylinder is rotatably connected to the center of the upper surface of the bearing plate.

[0019] By adopting the above technical solution, the coordinated use of the adjusting cylinder, side mounting bracket and bearing plate in the adjusting support assembly allows the precast box girder to be demolded without removing the adjusting support template. The adjusting support templates on both sides rotate and shift outward, which facilitates the disassembly of the precast box girder and the subsequent sealing and pouring work. This eliminates the need to repeatedly reinstall each component, reduces the labor intensity of workers and improves work efficiency.

[0020] A further improvement of the technical solution of the present invention is that: the inner wall of the side mounting bracket is snapped into the bottom end of the fitting support arc plate, the side mounting bracket and the fitting support arc plate are fixedly connected to one side of the adjusting support template by screws, and the inner wall of the fitting support arc plate is fixedly connected to both ends of the reinforcing plate.

[0021] A further improvement of the technical solution of the present invention is that: the back side of the inner mold is fixedly connected to the front side of the side mold, a protruding plate is fixedly connected to the front side of the side mold, and the bottom surface of the protruding plate overlaps with one side of the adjusting support template.

[0022] A further improvement of the technical solution of the present invention is that: the bottom side of the rubber sealing arc block is fixedly connected to one end of the base plate, one end of the base plate is rotatably connected to the bottom end of the adjusting support template, the bottom surface of the base plate is fixedly connected to the upper surface of the support frame, and the upper surface of the support frame is fixedly connected to the bottom surface of the side mold.

[0023] By adopting the above technical solution, the use of the connection between the rubber sealing arc block and the plug strip, as well as the connection between the convex plate and the adjusting support template, improves the sealing performance after the mold is sealed, avoids the problem of cement leakage, and thus improves the finished quality of the precast box girder.

[0024] Due to the adoption of the above technical solution, the technical progress achieved by this invention compared to the prior art is as follows:

[0025] 1. This invention provides a precast box girder template that is easy to assemble and disassemble and has a stable connection. The components that connect to the adjusting support template in the adjusting support assembly are all installed with screws. In addition, with the cooperation of the hanging plate and the bow-shaped limiting frame, it is convenient to assemble and disassemble. At the same time, the support formed by the fitting support arc plate and the reinforcing plate on the bottom side of one end of the adjusting support template improves the structural strength of the adjusting support template.

[0026] 2. This invention provides a precast box girder formwork that is easy to assemble and disassemble and has a stable connection. By using the auxiliary support column, bearing plate, upper support rod and external support arc plate in combination, the upper support rod can be integrated with the auxiliary support column through the external support arc plate after the formwork is closed, so as to support the formwork and further improve the stability of the formwork.

[0027] 3. This invention provides a precast box girder formwork that is easy to assemble and disassemble and has a stable connection. By utilizing the coordinated use of the adjusting cylinder, side mounting bracket and bearing plate in the adjusting support assembly, the precast box girder can be demolded without removing the adjusting support formwork. Moreover, the outward rotation and offset of the adjusting support formwork on both sides makes the disassembly of the precast box girder more convenient, and also facilitates the subsequent sealing and pouring work. It eliminates the need to repeatedly reinstall each component, reducing the labor intensity of workers and improving work efficiency.

[0028] 4. This invention provides a precast box girder template that is easy to assemble and disassemble and has a stable connection. By using the joint of rubber sealing arc blocks and plug strips, as well as the joint of convex plates and adjusting support templates, the sealing performance after the mold is sealed is improved, avoiding the problem of cement leakage, thereby improving the finished quality of the precast box girder. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the main device structure of the present invention;

[0030] Figure 2 This is a schematic diagram of the adjustment support component structure of the present invention;

[0031] Figure 3 This is an enlarged schematic diagram of the structure at point A of the present invention;

[0032] Figure 4 This is a schematic diagram of the side mold structure of the present invention;

[0033] Figure 5 This is a schematic diagram of the adjustable support template structure of the present invention;

[0034] Figure 6 This is a schematic diagram of the right-side structure of the adjustable support template of the present invention;

[0035] Figure 7 This is a schematic diagram of the auxiliary support column structure of the present invention.

[0036] In the diagram: 1. Main body; 2. Side mold; 3. Inner mold; 4. Adjustable support template; 5. Base plate; 6. Support base frame; 7. Adjustable support assembly; 8. Auxiliary support column; 9. Adjustable cylinder; 10. Bearing plate; 11. Side mounting bracket; 12. Fitting support arc plate; 13. Reinforcing plate; 14. Bow-shaped limiting bracket; 15. Bearing slot; 16. Protruding plate; 17. Hanging ring; 18. Lateral limiting hanging rod; 19. Rubber sealing arc block; 20. Arc block fitting groove; 21. Insert strip; 22. Upper support rod; 23. External support arc plate; 24. Hanging plate. Detailed Implementation

[0037] The present invention will be further described in detail below with reference to embodiments: Example 1

[0038] like Figure 1-7 As shown, the present invention provides a precast box girder template that is easy to assemble and disassemble and has a stable connection, including a main device 1, which includes a module unit, a reinforcing support unit and an auxiliary sealing unit.

[0039] The module unit includes a side mold 2, an inner mold 3, an adjustable support template 4, a base plate 5, and a support base frame 6. The reinforcement support unit includes an adjustable support assembly 7 and an auxiliary support column 8 for supporting and adjusting the adjustable support template 4. The auxiliary sealing unit includes a rubber sealing arc block 19 and a plug strip 21.

[0040] The adjusting support assembly 7 includes a bearing plate 10, a side mounting bracket 11, a fitting support arc plate 12, a reinforcing plate 13, and an arch-shaped limiting bracket 14. One end of the support base frame 6 has a bearing groove 15 for engaging the bearing plate 10 on its upper surface. One end of the rubber sealing arc block 19 has an arc block fitting groove 20 for engaging the insert strip 21. The adjusting support assembly 7 is located on the right side of the adjusting support template 4, and the side mold 2 is located on the back side of the adjusting support template 4.

[0041] A hanging plate 24 is fixedly connected to the side of the adjusting support template 4 near the adjusting support assembly 7. The inner wall of the hanging plate 24 is engaged with the outer wall of one end of the side mounting bracket 11. The upper surface of the bow-shaped limiting bracket 14 is fixedly connected to the bottom surface of one end of the adjusting support template 4. The side mounting bracket 11 is first aligned with the hanging plate 24 installed on one side of the adjusting support template 4. Then, the bearing plate 10 is installed into the bearing slot 15. After that, the bearing slot 15 is fixed to the upper surface of the support base 6. Then, the bottom end of the fitting support arc plate 12 is installed into the side mounting bracket 11, and both ends are fixed to the adjusting support template 4 with screws. At this time, the side mounting bracket 11 is also fixed to the adjusting support template 4.

[0042] The top of the auxiliary support column 8 is rotatably connected to an upper support rod 22, and the top of the upper support rod 22 is rotatably connected to a clamping plate shaft. The top of the clamping plate shaft is fixedly connected to the bottom of one end of the adjusting support template 4 by screws. An external support arc plate 23 is fixedly connected to the outer wall of the upper support rod 22. The bottom end of the external support arc plate 23 is movably connected to the top of the auxiliary support column 8. After the adjusting support template 4 is closed, the upper support rod 22 can form an integral part with the auxiliary support column 8 using the external support arc plate 23, which can support the adjusting support template 4 and further improve the stability of the adjusting support template 4.

[0043] The bottom end of the auxiliary support column 8 is rotatably connected to the upper surface of the bearing plate 10. The outer wall of the bottom end of the bearing plate 10 is engaged with the inner wall of the bearing groove 15. The front of the side mold 2 is fixedly connected with a hanging ring 17, and the inner wall of the hanging ring 17 is engaged with a lateral limiting hanging rod 18. Example 2

[0044] like Figure 1-7As shown, based on Embodiment 1, the present invention provides a technical solution: Preferably, the center of the side of the side mounting bracket 11 away from the adjusting support template 4 is rotatably connected to the top of the adjusting cylinder 9, and the bottom of the adjusting cylinder 9 is rotatably connected to the center of the upper surface of the bearing plate 10. When the adjusting cylinder 9 is activated, it pushes the side mounting bracket 11 to drive the adjusting support template 4 to rotate counterclockwise around the connecting shaft with the base plate 5, and the insertion strip 21 gradually comes into contact with the top of the rubber sealing arc block 19. At the same time, the inner side of the adjusting support template 4 gradually moves closer to the convex plate 16. When the inner side of the adjusting support template 4 comes into contact with the bottom edge of the convex plate 16, the insertion strip 21 is exactly connected with the arc block contact groove 20, and the auxiliary support column 8 and the upper support rod 22 are exactly perpendicular to the bearing plate 10. The bottom of the external supporting arc plate 23 cooperates with the upper edge of the auxiliary support column 8 to form a supporting effect on the adjusting support template 4.

[0045] The inner wall of the side mounting bracket 11 is snapped into the bottom end of the fitting support arc plate 12. The side mounting bracket 11 and the fitting support arc plate 12 are fixedly connected to one side of the adjusting support template 4 by screws. The inner wall of the fitting support arc plate 12 is fixedly connected to both ends of the reinforcing plate 13.

[0046] The back of the inner mold 3 is fixedly connected to the front of the side mold 2. The front of the side mold 2 is fixedly connected to a protruding plate 16, and the bottom surface of the protruding plate 16 overlaps with one side of the adjusting support template 4.

[0047] The bottom side of the rubber sealing arc block 19 is fixedly connected to one end of the base plate 5, one end of the base plate 5 is rotatably connected to the bottom end of the adjusting support template 4, the bottom surface of the base plate 5 is fixedly connected to the upper surface of the support base frame 6, and the upper surface of the support base frame 6 is fixedly connected to the bottom surface of the side mold 2. The use of the rubber sealing arc block 19 and the plug strip 21, as well as the use of the protruding plate 16 and the adjusting support template 4, improves the sealing performance after the mold is sealed, avoids the problem of cement leakage, and thus improves the finished quality of the precast box girder.

[0048] The working principle of this precast box girder formwork, which is easy to assemble and disassemble and has a stable connection, will be explained in detail below.

[0049] like Figure 1-7 As shown, in use, the side mounting bracket 11 is first connected to the hanging plate 24 installed on one side of the adjusting support template 4, and then the bearing plate 10 is installed into the bearing slot 15. After that, the bearing slot 15 is fixed to the upper surface of the support base 6. Then, the bottom end of the fitting support arc plate 12 is installed into the side mounting bracket 11, and both ends are fixed to the adjusting support template 4 with screws. At this time, the side mounting bracket 11 is also fixed to the adjusting support template 4.

[0050] Then, the top of the upper support rod 22 is fixed to the bottom of one end of the adjusting support template 4 with screws. Finally, the other set of side molds 2 is connected to the base plate 5 with screws. Then, the two ends of the transverse limiting rod 18 are attached to the corresponding two sets of hanging rings 17 to complete the connection between the other set of side molds 2 and the adjusting support template 4. At the same time, the screws installed on the edge of the adjusting support template 4 can be used to fix the other set of side molds 2.

[0051] When disassembly is required, simply reverse the operation to remove all the mounting components.

[0052] It should be noted that, in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes the element.

[0053] The present invention has been described in detail above. However, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, any modifications or improvements that do not depart from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A prefabricated box girder form which is convenient to disassemble and assemble and stable in connection, comprising a main body device (1), characterized in that: The main device (1) comprises a module unit, a reinforcing support unit and an auxiliary sealing unit; The module unit comprises a side mold (2), an inner mold (3), an adjusting support template (4), a bottom plate (5) and a support chassis (6), the reinforcing support unit comprises an adjusting support assembly (7) and an auxiliary support column (8) for supporting and adjusting the adjusting support template (4), and the auxiliary sealing unit comprises a rubber sealing arc block (19) and a plug-in strip (21); The adjusting support assembly (7) comprises a bearing clamping plate (10), a side installation frame (11), a fitting support arc plate (12), a reinforcing plate (13) and an arch-shaped limiting frame (14), one end of the upper surface of the support chassis (6) is provided with a bearing clamping groove (15) for clamping the bearing clamping plate (10), one end of the rubber sealing arc block (19) is provided with an arc block fitting groove (20) for clamping the plug-in strip (21), the adjusting support assembly (7) is located on the right side of the adjusting support template (4), and the side mold (2) is located on the back of the adjusting support template (4). The top end of the auxiliary support column (8) is rotatably connected with an upper support rod (22), the top end of the upper support rod (22) is rotatably connected with a clamping plate rotating shaft, the top end of the clamping plate rotating shaft is fixedly connected with one end of the bottom of the adjusting support template (4) through screws, and the outer wall of the upper support rod (22) is fixedly connected with an external support arc plate (23). The bottom end of the auxiliary support column (8) is rotatably connected with the upper surface of the bearing clamping plate (10), the bottom end of the outer wall of the bearing clamping plate (10) is clamped with the inner wall of the bearing clamping groove (15), the front surface of the side mold (2) is fixedly connected with a hanging ring (17), and the inner wall of the hanging ring (17) is clamped with a transverse limiting hanging rod (18).

2. The prefabricated box girder formwork according to claim 1, characterized in that: The side of the adjusting support template (4) close to the adjusting support assembly (7) is fixedly connected with a hanging plate (24), the inner wall of the hanging plate (24) is clamped with one end of the outer wall of the side installation frame (11), and the upper surface of the arch-shaped limiting frame (14) is fixedly connected with the bottom surface of one end of the adjusting support template (4).

3. The prefabricated box girder formwork of claim 1, wherein: The side of the side installation frame (11) away from the adjusting support template (4) is rotatably connected with an adjusting cylinder (9) at the center, and the bottom end of the adjusting cylinder (9) is rotatably connected with the center of the upper surface of the bearing clamping plate (10).

4. The prefabricated box girder formwork of claim 1, wherein: The inner wall of the side installation frame (11) is clamped with the bottom end of the fitting support arc plate (12), and the side installation frame (11) and the fitting support arc plate (12) are fixedly connected with one side of the adjusting support template (4) through screws.

5. The prefabricated box girder formwork of claim 1, wherein: The back surface of the inner mold (3) is fixedly connected with the front surface of the side mold (2), the front surface of the side mold (2) is fixedly connected with a convex plate (16), and the bottom surface of the convex plate (16) is overlapped with one side of the adjusting support template (4).

6. The prefabricated box girder formwork of claim 1, wherein: The bottom side of the rubber sealing arc block (19) is fixedly connected with one end of the bottom plate (5), one end of the bottom plate (5) is rotatably connected with the bottom end of the adjusting support template (4), the bottom surface of the bottom plate (5) is fixedly connected with the upper surface of the support bottom frame (6), and the upper surface of the support bottom frame (6) is fixedly connected with the bottom surface of the side mold (2).

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