Cast-in-place box girder arc-shaped cantilever inclined web wing plate supporting truss
By designing a support truss containing arcuate components, horizontal grooves, vertical and oblique connection pipes, the problems of uneven support and insufficient space in the prior art are solved, and higher lateral stiffness and lower production costs are achieved, and template support is suitable for arcuate cantilever oblique bender wing structures.
Patent Information
- Application Number
- CN202422090700.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-27
- Publication Date
- 2025-07-29
- Estimated Expiration
- 2034-08-27
AI Technical Summary
In the prior art, the rod force distribution of triangular trusses is uneven when the template supports the arc-shaped cantilever inclined bender structure, and node deformation is prone to occur. Although the arc-shaped truss is subjected to uniform force, the space demand is large and the lateral stiffness is insufficient, making it difficult to meet the support demand of arc-shaped cantilever inclined bender structure.
A support truss including arcuate members, horizontal grooves, vertical connecting pipes and oblique connection pipes is designed, and a semi-arch structure is adopted to strengthen lateral stiffness through vertical and oblique connection pipes, and a reinforcement plate is added to the connecting ends of arcuate members and horizontal grooves to enhance stability.
It achieves a smaller space occupation and higher lateral stiffness, meeting the formwork support needs of arc-shaped cantilever oblique wing panel structure, while reducing production costs and construction complexity.
Smart Images
Figure CN223163783U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of formwork supports for cast-in-situ box girders, and particularly relates to a support truss for the arc-shaped cantilever inclined abdominal wing plates of a cast-in-situ box girder. Background Art
[0002] A cast-in-situ box girder refers to a box-shaped girder cast on-site with concrete at a construction site, and can also be called a "plate box girder". When using concrete to cast a box girder in-situ, formwork and a support structure for supporting the formwork need to be erected. In the prior art, most commonly, a bottom support frame + a top truss is used to support the formwork. Common types of top trusses include triangular trusses and arched trusses. Although a triangular truss has high stability and strength in structure, when it is stressed, the bar forces are unevenly distributed, and joint deformation is likely to occur, especially when it is used as the formwork support for an arc-shaped cantilever inclined abdominal wing plate structure (the wing plate of a cast-in-situ box girder). Compared with a triangular truss, under the same span, an arched truss can bear greater pressure and the stress is more uniform. However, due to its structural design limitations, it has a large demand for structural space and a small lateral stiffness, and it is difficult to meet the formwork support requirements of an arc-shaped cantilever inclined abdominal wing plate structure. Summary of the Utility Model
[0003] The utility model provides a support truss for the arc-shaped cantilever inclined abdominal wing plates of a cast-in-situ box girder to solve the problems existing in the prior art.
[0004] To achieve the above object, the utility model provides the following technical solutions:
[0005] A support truss for the arc-shaped cantilever inclined abdominal wing plates of a cast-in-situ box girder includes an arc-shaped member, a horizontal groove, a vertical connecting pipe, and an inclined connecting pipe; the arc-shaped member includes an inferior arc section and an inclined section, one end of the inferior arc section is fixedly connected to the end of the horizontal groove, and the other end is fixedly connected to the bottom end of the inclined section; one end of the vertical connecting pipe is fixedly connected to the arc-shaped member, and the other end is fixedly connected to the horizontal groove; one end of the inclined connecting pipe is fixedly connected to the arc-shaped member, and the other end is fixedly connected to the horizontal groove.
[0006] Through the above technical solutions, the utility model designs a brand-new support truss. Different from the traditional arched truss, the support truss of the utility model belongs to a semi-arch structure, occupies less space, and can better meet the formwork support requirements of the arc-shaped cantilever inclined abdominal wing plate structure. Moreover, the support truss of the utility model uses vertical connecting pipes and inclined connecting pipes to strengthen the overall lateral stiffness to overcome the deficiencies of the existing arched trusses.
[0007] Preferably, a plurality of vertical connecting pipes are provided, the plurality of vertical connecting pipes are spaced apart from each other, and an inclined connecting pipe is arranged between two adjacent vertical connecting pipes.
[0008] Preferably, the inclined connecting pipe is inclined towards the connection end of the inferior arc section and the horizontal groove.
[0009] Preferably, it further includes a reinforcing plate, and the reinforcing plate is fixedly connected to the side surface of the connection end of the inferior arc section and the horizontal groove.
[0010] Preferably, the reinforcing plate has two sides, and the two reinforcing plates are respectively located on both sides of the horizontal groove.
[0011] Preferably, the arc-shaped member is an arc-shaped channel steel, the horizontal groove is a horizontal channel steel, and the inferior arc section of the arc-shaped member is welded to the end of the horizontal groove.
[0012] Preferably, the groove surfaces of the arc-shaped member and the horizontal groove face each other.
[0013] Preferably, both ends of the vertical connecting pipe are respectively located in the grooves of the arc-shaped member and the horizontal groove, and both ends of the inclined connecting pipe are respectively located in the grooves of the arc-shaped member and the horizontal groove.
[0014] Preferably, both the vertical connecting pipe and the inclined connecting pipe are steel pipes.
[0015] The beneficial effects of the present utility model are as follows:
[0016] 1. Compared with the prior art, the support truss of the present utility model occupies less space and can better meet the formwork support requirements of the arc-shaped cantilever inclined web plate structure. Moreover, the support truss of the present utility model uses vertical connecting pipes and inclined connecting pipes to strengthen the overall lateral stiffness to overcome the deficiencies of the existing arched truss.
[0017] 2. Compared with the prior art, the support truss of the present utility model uses a reinforcing plate to reinforce the connection end of the inferior arc section and the horizontal groove to enhance the overall stability and safety of the support truss of the present utility model.
[0018] 3. Compared with the prior art, each component of the support truss of the present utility model is made of conventional steel, which is simple to manufacture and has a low production cost. Description of the Drawings
[0019] Figure 1 is a structural schematic diagram of the support truss for the arc-shaped cantilever inclined web plate of the cast-in-place box girder in the embodiment of the present utility model;
[0020] Figure 2 is a structural diagram of the support truss for the arc-shaped cantilever inclined web plate of the cast-in-place box girder in the embodiment of the present utility model.
[0021] Description of the Reference Numerals:
[0022] 1. Arc-shaped member; 2. Horizontal groove; 3. Vertical connecting pipe; 4. Inclined connecting pipe; 5. Reinforcing plate. Detailed Embodiment
[0023] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.
[0024] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present utility model.
[0025] As Figure 1 and Figure 2 shown, this embodiment discloses a cast-in-place box girder curved cantilever inclined web and wing plate support truss, which is used to solve the problems existing in the prior art. The support truss in this embodiment includes an arc member 1, a horizontal groove 2, a vertical connecting pipe 3, an inclined connecting pipe 4, and a reinforcing plate 5.
[0026] In this embodiment, the arc member 1 is an arc channel steel, the horizontal groove 2 is a horizontal channel steel, the vertical connecting pipe 3 and the inclined connecting pipe 4 are both steel pipes, and the reinforcing plate 5 is a steel plate. These materials are all materials that are easy to obtain in engineering, with low cost and strength meeting the strength requirements.
[0027] Specifically, the arc member 1 includes a minor arc section and an inclined section. One end of the minor arc section is welded to the end of the horizontal groove 2, and the other end is welded to the bottom end of the inclined section. One end of the vertical connecting pipe 3 is welded to the arc member 1, and the other end is welded to the horizontal groove 2. One end of the inclined connecting pipe 4 is welded to the arc member 1, and the other end is welded to the horizontal groove 2.
[0028] Through the above technical solutions, the support truss of the present utility model occupies less space and can better meet the formwork support requirements of the curved cantilever inclined web and wing plate structure. Moreover, the support truss of the present utility model uses the vertical connecting pipe 3 and the inclined connecting pipe 4 to strengthen the overall lateral stiffness to overcome the deficiencies of the existing arched truss.
[0029] Preferably, the arc member 1 can be made of 8#, 10#, or 12.6# channel steel, with its groove surface facing downwards, and the length, bending, and arc can be determined according to the size of the bridge wing plate structure. The horizontal groove 2 can be made of 8#, 10#, or 12.6# channel steel, with its groove surface facing upwards, and the length is determined according to the size of the bridge wing plate structure. When designing, the arc member 1 and the horizontal groove 2 use the same specification of channel steel.
[0030] Compared with the prior art, the arc-shaped member 1 faces the groove of the horizontal groove 2, which can play a good role in positioning the connecting pipe, and the non-groove surfaces of the arc-shaped member 1 and the horizontal groove 2 are relatively smooth, with a larger stress area.
[0031] In this embodiment, the number of the above-mentioned vertical connecting pipes 3 is three, and steel pipes with a diameter of φ48.3×3.5mm are used for convenient connection. The number of the above-mentioned inclined connecting pipes 4 is two, and steel pipes with a diameter of φ48.3×3.5mm are used for convenient connection.
[0032] Furthermore, the three vertical connecting pipes 3 are spaced apart from each other, and an inclined connecting pipe 4 is arranged between two adjacent vertical connecting pipes 3. The two ends of the vertical connecting pipe 3 are respectively welded in the grooves of the arc-shaped member 1 and the horizontal groove 2, while the two ends of the inclined connecting pipe 4 are respectively welded in the grooves of the arc-shaped member 1 and the horizontal groove 2 to enhance the structural strength of the support truss of the present utility model.
[0033] Even further, the inclined connecting pipe 4 inclines towards the connection end of the horizontal groove 2 in the minor arc section, and the included angle between it and the horizontal groove 2 is an acute angle to further enhance the lateral stiffness of the support truss of the utility model.
[0034] It should be noted that in other embodiments, the numbers of the above-mentioned vertical connecting pipes 3 and inclined connecting pipes 4 can be increased or decreased according to actual situations.
[0035] In order to enhance the connection strength between the arc-shaped member 1 and the horizontal groove 2, the two sides of the connection weld between the arc-shaped member 1 and the horizontal groove 2 are welded and reinforced by the above-mentioned reinforcing plates 5.
[0036] It should be added that the support truss of the present utility model adopts a standardized design, and can be batch processed in the factory first. After being transported to the construction site, multiple support trusses are then connected into a whole through steel pipes and fasteners, and cooperate with the disc buckle type support frame, wooden square timbers and wooden formwork to form a box girder wing plate support system.
[0037] Compared with the prior art, the support truss of the present utility model is simple in processing and manufacturing, convenient in transportation, hoisting and installation, high in structural strength, safe and stable, high in turnover rate, small in steel consumption, and can effectively save construction costs. Moreover, the support truss of the present utility model can be customized according to the size of the box girder wing plate of the bridge, has strong applicability, is applicable to all cast-in-place box girder wing plate constructions, especially applicable to the arc-shaped cantilever inclined web wing plates, and has a broad application prospect.
[0038] The steps of the installation and demolition in the embodiment of the present utility model are as follows:
[0039] After the cast-in-place box girder bottom plate support system is erected, the sling is tied to the support truss of the present utility model, and then the support truss is lifted in bundles onto the bottom formwork of the box girder bottom plate by a crane, and the number of hoisted at one time is controlled within 10. Then, two workers lift and place the support trusses to the designated positions one by one, and connect them with the vertical connecting pipe 3 or the diagonal connecting pipe 4 through steel pipe fasteners, and connect multiple support trusses into a whole, and then install wooden square timbers and wooden formworks to form a support system for the cast-in-place box girder arc-shaped cantilever inclined web and wing plate.
[0040] After the construction of the cast-in-place box girder is completed and the concrete curing reaches the age, remove the steel pipe fasteners used to connect each support truss, remove each support truss and the full hall support system one by one, neatly stack the materials, and repeat the above process in turn until the entire bridge construction is completed. Using this support truss can speed up the construction speed, save construction costs, and improve the safety of construction operations.
[0041] Compared with the existing method, since each support truss is an integral structure and has a light weight, it can be transported to the construction site in bundles after being processed, lifted onto the bottom formwork of the box girder bottom plate by a crane, and installed and connected with steel pipe fasteners after being placed. After the construction is completed, remove the steel pipe fasteners used to connect multiple support trusses to disassemble the support truss, thereby effectively improving the operation efficiency.
[0042] The above are all the preferred embodiments of the present utility model, and the protection scope of the present utility model is not limited thereby. Therefore, all equivalent changes made according to the structure, shape, and principle of the present utility model shall be covered within the protection scope of the present utility model.
Claims
1. A cast-in-place box girder arc cantilever inclined web and wing plate support truss, characterized in that, It includes an arc-shaped member (1), a horizontal groove (2), a vertical connecting pipe (3) and an inclined connecting pipe (4); the arc-shaped member (1) includes a minor arc section and an inclined section, one end of the minor arc section is fixedly connected to the end of the horizontal groove (2), and the other end is fixedly connected to the bottom end of the inclined section; one end of the vertical connecting pipe (3) is fixedly connected to the arc-shaped member (1), and the other end is fixedly connected to the horizontal groove (2); one end of the inclined connecting pipe (4) is fixedly connected to the arc-shaped member (1), and the other end is fixedly connected to the horizontal groove (2).
2. The cast-in-place box girder arc cantilever inclined web and wing plate support truss according to claim 1, wherein, A plurality of the vertical connecting pipes (3) are provided, the plurality of vertical connecting pipes (3) are spaced from each other, and one of the inclined connecting pipes (4) is provided between two adjacent vertical connecting pipes (3).
3. The cast-in-place box girder arc cantilever inclined web and wing plate support truss according to claim 1, characterized in that, The inclined connecting pipe (4) inclines towards the connection end of the minor arc section and the horizontal groove (2).
4. The cast-in-place box girder arc cantilever inclined web and wing plate support truss according to claim 1, characterized in that, It further includes a reinforcing plate (5), and the reinforcing plate (5) is fixedly connected to the side surface of the connection end of the minor arc section and the horizontal groove (2).
5. The cast-in-situ box girder arc cantilever inclined web and wing plate support truss according to claim 4, characterized in that, Two sides of the reinforcing plate (5) are provided, and the two sides of the reinforcing plate (5) are respectively located on both sides of the horizontal groove (2).
6. The cast-in-place box girder arc cantilever inclined web and wing plate support truss according to claim 1, characterized in that, The arc-shaped member (1) is an arc-shaped channel steel, the horizontal groove (2) is a horizontal channel steel, and the minor arc section of the arc-shaped member (1) is welded to the end of the horizontal groove (2).
7. The cast-in-place box girder arc cantilever inclined web and wing plate support truss according to claim 6, characterized in that, The groove surfaces of the arc-shaped member (1) and the horizontal groove (2) face each other.
8. The cast-in-situ box girder arc cantilever inclined web and wing plate support truss according to claim 7, characterized in that, Both ends of the vertical connecting pipe (3) are respectively located in the groove of the arc-shaped member (1) and the groove of the horizontal groove (2), and both ends of the inclined connecting pipe (4) are respectively located in the groove of the arc-shaped member (1) and the groove of the horizontal groove (2).
9. The cast-in-place box girder arc cantilever inclined web and wing plate support truss according to claim 1, wherein, Both the vertical connecting pipe (3) and the inclined connecting pipe (4) are steel pipes.