Adjustable profile steel supporting device for cast-in-place box girder door opening

Abstract

The utility model relates to the technical field of bridge construction supporting devices, and discloses an adjustable profile steel supporting device for a cast-in-place box girder door opening, which comprises a plurality of groups of supporting units, each group of supporting units comprises a bearing plate, two symmetrical bearing seats are arranged on the upper surface of the bearing plate, two symmetrical bearing columns are arranged on the upper surface of each bearing seat, and the upper surface of each bearing seat is provided with a supporting plate. A height adjusting unit capable of adjusting the height is arranged at the upper end of each bearing column, transverse keels are arranged on every two adjacent height adjusting units, and a plurality of longitudinal keels are arranged on the upper side face of each transverse keel. According to the box girder body supporting device, the multiple supporting units are arranged, the whole supporting units can be adjusted through the height adjusting units, the telescopic connecting units, the first adjusting units and the second adjusting units, all parts can be repeatedly used, and the efficiency of building the box girder body supporting device is improved; and meanwhile, the device is suitable for supporting box girder bodies of different sizes or volumes, and the applicability of the whole device is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of bridge construction support devices, specifically an adjustable steel support device for the portal opening of a cast-in-place box girder. Background Technology

[0002] With the rapid development of municipal transportation, more and more elevated bridges are emerging. It is common for elevated bridges to pass under existing roads (such as urban roads, provincial highways and national highways) and rivers. When cast-in-place box girders pass under structures, roads and rivers, it is necessary to build portals on the roads or rivers. Therefore, it is necessary to build portal support devices under the cast-in-place box girders.

[0003] To improve the safety of supporting portal openings in cast-in-place box girders, existing technologies have made numerous improvements to the support devices used for these openings. For example, patent publication number CN207091919U discloses a portal-type support structure for cast-in-place box girders, comprising three concrete ground beams respectively positioned on the left, middle, and right sides of the access road. Each concrete ground beam has a row of steel pipe pile piers. Double-layered H50 steel crossbeams are installed between the upper ends of the three rows of steel pipe pile piers. Bailey truss longitudinal beams are installed on these double-layered H50 steel crossbeams. The Bailey truss longitudinal beams are connected and fixed using a frame. A full-span scaffold is installed on the Bailey truss longitudinal beams, with a top support for installing the box girder to be cast at the top layer. By designing a portal-type support system combining Bailey trusses and a full-span scaffold, the requirements for underpass traffic and the safety and stability issues of erecting tall scaffolds are solved. The structure is simple, the technology is mature, the stress distribution is clear, and construction is convenient. By hanging banners and LED light strips on the Bailey trusses on both sides of the doorway, corporate culture can be promoted and the environment can be beautified. At the same time, it can guide the eye and help drive safety.

[0004] The aforementioned patents have significant beneficial effects, but in practical application, they still have the following shortcomings:

[0005] The aforementioned comparative documents describe the use of numerous full-span supports installed beneath the box girder to support and facilitate the casting of the girder's portal opening. However, the construction of these full-span supports is cumbersome, requiring significant manpower and resources. Furthermore, the limited size of these supports prevents adjustment based on the required portal opening dimensions. Therefore, there is an urgent need in this field to improve the adjustable steel support device for cast-in-place box girder portal openings, thereby addressing the shortcomings of the existing technology. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides an adjustable steel support device for the portal opening of cast-in-place box girders, which improves the efficiency of constructing support devices for the box girder body. It is also applicable to the support of box girders of different sizes or volumes, thus improving the overall applicability of the device.

[0007] To achieve the above objectives, this utility model provides the following technical solution: an adjustable steel support device for a cast-in-place box girder portal, comprising several sets of support units. Each set of support units includes a bearing plate. The upper surface of the bearing plate is provided with two symmetrical bearing seats. The upper surface of each bearing seat is provided with two symmetrical bearing columns. The upper end of each bearing column is provided with a height adjustment unit capable of adjusting its height. A transverse keel is provided on each two adjacent height adjustment units. Several longitudinal keels are provided on the upper side of each transverse keel. A casting template is laid on the upper side of the several longitudinal keels. The box girder body is cast on top of the casting template. A telescopic connecting unit is provided between the sides of two adjacent bearing columns. Each bearing seat is provided with a first adjustment unit for moving the two bearing columns toward each other or away from each other. The bearing plate is provided with a second adjustment unit for moving the two bearing seats toward each other or away from each other.

[0008] Preferably, the height adjustment unit includes a U-shaped snap-fit ​​bracket above each support column that is adapted to the transverse keel. A threaded column is fixedly connected to the lower side of the snap-fit ​​bracket. An insertion groove adapted to the threaded column is opened at the upper end of the support column. An adjustment ring is threadedly connected to the side of the threaded column.

[0009] Preferably, a limiting ring is fixedly connected to the side of the adjusting ring, a limiting groove adapted to the limiting ring is opened at the upper end of the bearing column, and a limiting bolt with one end abutting against the side of the limiting ring is threaded to the upper side of the bearing column.

[0010] Preferably, the connecting unit includes a plurality of connecting plates disposed between every two adjacent bearing columns. Two symmetrical first connecting rods and second connecting rods are rotatably connected to the two ends of the two connecting plates, respectively. The first connecting rods and second connecting rods are X-shaped and rotatable. The ends of the first connecting rods and second connecting rods away from the connecting plates are rotatably connected to the side of the bearing column and can be disassembled.

[0011] Preferably, a limiting screw passes through between the two connecting plates, and the limiting screw has a plurality of first limiting nuts threaded to its side for limiting the two connecting plates.

[0012] Preferably, the first adjustment unit includes a first slider fixedly connected to the lower end of each bearing column, and a first groove adapted to the first slider is opened on the upper side of each bearing seat. A first bidirectional lead screw is rotatably connected in the first groove. The first bidirectional lead screw passes through the two first sliders and is threadedly connected to the first sliders. One end of the first bidirectional lead screw passes through the bearing seat and extends to the outside. A second limiting nut is threadedly connected to the side of the end of the first bidirectional lead screw extending to the outside.

[0013] Preferably, the second adjustment unit includes a second slider fixedly connected to the lower side of each support seat. The upper surface of the support plate is provided with a second slide groove adapted to the second slider. A second bidirectional lead screw is rotatably connected in the second slide groove. The second bidirectional lead screw passes through the two second sliders and is threadedly connected to the second sliders. One end of the second bidirectional lead screw passes through the support plate and extends to the outside. A third limiting nut is threadedly connected to the side of the end of the second bidirectional lead screw that extends to the outside.

[0014] To address the shortcomings of existing technologies, this utility model provides an adjustable steel support device for the portal opening of cast-in-place box girders, overcoming the deficiencies of existing technologies. The beneficial effects of this utility model are as follows:

[0015] 1. In this utility model, by setting up several support units, the entire support unit can be adjusted through a height adjustment unit, a telescopic connecting unit, a first adjustment unit, and a second adjustment unit. All parts can be reused, which improves the efficiency of building the box girder support device. At the same time, it is applicable to the support of box girders of different sizes or volumes, thus improving the applicability of the overall device.

[0016] 2. In this utility model, by setting a snap-fit ​​frame, a limiting ring, and a limiting bolt, after the height of the snap-fit ​​frame is adjusted by the adjusting ring, the position of the limiting ring is limited by the limiting bolt, thereby limiting the position of the adjusting ring. Moreover, the snap-fit ​​frame is U-shaped and adapted to the horizontal keel. Neither the snap-fit ​​frame nor the adjusting ring will rotate on its own, thereby improving the stability of the snap-fit ​​frame after the height is adjusted.

[0017] 3. In this utility model, by setting up a telescopic connecting unit, and through the cooperation of the connecting plate, the first connecting rod and the second connecting rod, two bearing columns can be connected and fixed at any position within a certain range. After the position of the bearing column is adjusted, the position of the two connecting plates is limited and fixed by the limiting screw and the first limiting nut, thereby limiting the position between the bearing columns. Furthermore, the first connecting rod and the second connecting rod can be installed between each bearing column, so that several bearing columns form a whole, improving the strength and stability of the bearing columns supporting the box girder body.

[0018] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained by means of the structures pointed out in the description, claims, and drawings. Attached Figure Description

[0019] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0020] Figure 1 This is a schematic diagram of the structure of the box girder body partially supported by this utility model;

[0021] Figure 2 This is a schematic diagram of the transverse and longitudinal keels in this utility model;

[0022] Figure 3 This is a structural schematic diagram of one support plate and two support seats in this utility model;

[0023] Figure 4 This is a schematic diagram of the structure of the first slider and the second slider in this utility model;

[0024] Figure 5 This is a schematic diagram of the connecting plate and the limiting screw in this utility model;

[0025] Figure 6 This is a partial cross-sectional structural diagram of the load-bearing column and other components in this utility model.

[0026] In the diagram: 1. Bearing plate; 2. Bearing seat; 3. Bearing column; 4. Height adjustment unit; 5. Horizontal keel; 6. Longitudinal keel; 7. Casting formwork; 8. Box girder body; 9. Connection unit; 10. First adjustment unit; 11. Second adjustment unit; 12. Clip-on bracket; 13. Threaded column; 14. Insertion groove; 15. Adjustment ring; 16. Limiting ring; 17. Limiting groove; 18. Limiting bolt; 19. Connecting plate; 20. First connecting rod; 21. Second connecting rod; 22. Limiting screw; 23. First limiting nut; 24. First slider; 25. First slide groove; 26. First double-acting screw; 27. Second limiting nut; 28. Second slider; 29. ​​Second slide groove; 30. Second double-acting screw; 31. Third limiting nut. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0028] Example 1

[0029] Please see Figures 1-6An adjustable steel support device for the portal opening of a cast-in-place box girder includes several sets of support units. Each set of support units includes a bearing plate 1. The upper surface of the bearing plate 1 is provided with two symmetrical bearing seats 2. The upper surface of each bearing seat 2 is provided with two symmetrical bearing columns 3. The upper end of each bearing column 3 is provided with a height adjustment unit 4 that can adjust the height. A transverse keel 5 is provided on each two adjacent height adjustment units 4. Several longitudinal keels 6 are provided on the upper side of each transverse keel 5. A casting template 7 is laid on the upper side of the several longitudinal keels 6. The box girder body 8 is cast on the casting template 7. A telescopic connecting unit 9 is provided between the sides of two adjacent bearing columns 3. Each bearing seat 2 is provided with a first adjustment unit 10 for moving the two bearing columns 3 towards each other or away from each other. The bearing plate 1 is provided with a second adjustment unit 11 for moving the two bearing seats 2 towards each other or away from each other.

[0030] In this specific implementation embodiment: Before pouring the cast-in-place box girder body 8, a support unit needs to be erected below the box girder body 8 to be poured. In this embodiment, the support unit consists of multiple sets with identical configurations. Several sets of support units are placed sequentially on the foundation directly below the box girder body 8 to be poured. The spacing between several bearing columns 3 and several bearing plates 1 is determined according to the volume and weight of the box girder body 8 to be poured. When pouring a box girder body 8 with a smaller volume and weight, the spacing between the bearing columns 3 on a bearing plate 1 is increased through the first adjustment unit 10 and the second adjustment unit 11. When adjusting the spacing between the bearing columns 3, since the connecting unit 9 is telescopic, no additional customization of the connecting unit 9 is required, and the placement spacing between several bearing plates 1 is increased. Conversely, when pouring a box girder body 8 with a larger volume and weight, the spacing between several bearing columns 3 is decreased, and several bearing plates 1 are placed adjacent to each other. After the position of the bearing columns 3 is determined, several telescopic connecting units 9 are used to connect the bearing plates 1. The supporting columns 3 on the adjacent bearing plate 1 are connected to ensure the verticality of each supporting column 3. The transverse keel 5 is placed on several height adjustment units 4, and the height of the transverse keel 5 can be adjusted through the height adjustment units 4. Several longitudinal keels 6 are placed on the upper side of several transverse keels 5, and the transverse keels 5, longitudinal keels 6 and height adjustment units 4 are limited. They can be fixed on site by fasteners or spot welding. The casting template 7 is laid on several longitudinal keels 6 and the casting template 7 is used to form a cavity that fits the box girder body 8. Concrete is poured into the cavity formed by the casting template 7 to obtain the box girder body 8. The entire support unit can be adjusted through the height adjustment unit 4, the telescopic connecting unit 9, the first adjustment unit 10 and the second adjustment unit 11. It is suitable for supporting box girder bodies 8 of different volumes and weights, and all parts can be reused, which improves the efficiency of building the support device for the box girder body 8. It is also suitable for supporting box girder bodies 8 of different sizes or volumes, which improves the applicability of the overall device.

[0031] Example 2

[0032] Please see Figure 3 , Figure 4 and Figure 6This embodiment includes the above embodiment, wherein the height adjustment unit 4 includes a U-shaped snap-fit ​​bracket 12 located above each bearing column 3 and adapted to the transverse keel 5. A threaded column 13 is fixedly connected to the lower side of the snap-fit ​​bracket 12. The upper end of the bearing column 3 is provided with a plug groove 14 adapted to the threaded column 13. An adjustment ring 15 is threadedly connected to the side of the threaded column 13. A limit ring 16 is fixedly connected to the side of the adjustment ring 15. A limit groove 17 adapted to the limit ring 16 is provided at the upper end of the bearing column 3. A limit bolt 18 with one end abutting against the side of the limit ring 16 is threadedly connected to the upper side of the bearing column 3.

[0033] In this embodiment, the clamping frame 12 is inserted into the insertion slot 14 via the threaded post 13. When the height of the clamping frame 12 needs to be adjusted, the position of the adjusting ring 15 on the side of the threaded post 13 is adjusted by rotating the adjusting ring 15. After the height of the clamping frame 12 is adjusted, the limiting ring 16 on the side of the adjusting ring 15 is inserted into the limiting slot 17, and the limiting bolt 18 is threaded into the threaded hole on the upper side of the bearing column 3. The limiting bolt 18 is tightened, and one end of the limiting bolt 18 is pressed tightly against the side of the limiting ring 16 to limit the position of the limiting ring 16, thereby limiting the position of the adjusting ring 15. The clamping frame 12 is U-shaped and adapted to the transverse keel 5. Neither the clamping frame 12 nor the adjusting ring 15 will rotate on its own, thereby improving the stability of the clamping frame 12 after height adjustment and preventing the adjusting ring 15 from loosening due to vibration generated during the pouring of the box girder body 8.

[0034] Implementation Three

[0035] Please see Figures 1-5 This embodiment includes all the above embodiments. The connecting unit 9 includes several connecting plates 19 disposed between every two adjacent bearing columns 3. Two symmetrical first connecting rods 20 and second connecting rods 21 are rotatably connected to the two ends of the two connecting plates 19 respectively. The first connecting rods 20 and second connecting rods 21 are X-shaped and can rotate. The ends of the first connecting rods 20 and second connecting rods 21 away from the connecting plate 19 are rotatably connected to the side of the bearing column 3 and can be disassembled. A limiting screw 22 passes through the two connecting plates 19. Several first limiting nuts 23 for limiting the two connecting plates 19 are threadedly connected to the side of the limiting screw 22.

[0036] In this embodiment, each pair of adjacent load-bearing columns 3 is rotatably connected to several first connecting rods 20 and second connecting rods 21. The first connecting rods 20 and second connecting rods 21 are X-shaped and can rotate. When the spacing between the load-bearing columns 3 is adjusted, the first connecting rods 20 and second connecting rods 21 rotate without obstructing the adjustment of the spacing between the load-bearing columns 3. Within a certain range, two load-bearing columns 3 can be connected and fixed at any position. After the position of the load-bearing column 3 is adjusted, the limiting screw 22 passes through the two connecting plates 19, and several first limiting nuts 23 are rotated to clamp and fix the corresponding connecting plates 19, thereby fixing the position of the first connecting rods 20 and second connecting rods 21. This achieves the limiting connection of the positions of two adjacent load-bearing columns 3. The first connecting rods 20 and second connecting rods 21 can be installed between each load-bearing column 3, so that several load-bearing columns 3 form a whole, improving the strength and stability of the load-bearing columns 3 in supporting the box girder body 8.

[0037] Implementation 4

[0038] Please see Figures 1-4 This embodiment includes all the above embodiments. The first adjustment unit 10 includes a first slider 24 fixedly connected to the lower end of each bearing column 3. Each bearing seat 2 has a first groove 25 adapted to the first slider 24 on its upper side. A first bidirectional screw 26 is rotatably connected in the first groove 25. The first bidirectional screw 26 passes through the two first sliders 24 and is threadedly connected to the first sliders 24. One end of the first bidirectional screw 26 passes through the bearing seat 2 and extends to the outside. A second limiting nut 27 is threadedly connected to the side of the end of the first bidirectional screw 26 that extends to the outside.

[0039] In this embodiment, the specific implementation method is as follows: When it is necessary to adjust the distance between the two bearing columns 3 on the bearing seat 2, by rotating one end of the first bidirectional lead screw 26 extending to the outside, the threads on the first bidirectional lead screw 26 are symmetrical and opposite, so when the first bidirectional lead screw 26 rotates, it will drive the first slider 24 to slide in the first slide groove 25 towards or away from each other. The first slider 24 drives the corresponding bearing column 3 to move towards or away from each other on the bearing seat 2, so as to achieve the effect of adjusting the distance between the two bearing columns 3. After the position of the bearing column 3 is adjusted, the second limit nut 27 is tightened to limit and fix the position of the first bidirectional lead screw 26, thereby increasing the range that the overall device can support the box girder body 8.

[0040] Implementation Five

[0041] Please see Figures 1-4This embodiment includes all the above embodiments. The second adjustment unit 11 includes a second slider 28 fixedly connected to the lower side of each support seat 2. A second groove 29 adapted to the second slider 28 is opened on the upper surface of the support plate 1. A second bidirectional lead screw 30 is rotatably connected in the second groove 29. The second bidirectional lead screw 30 passes through the two second sliders 28 and is threadedly connected to the second sliders 28. One end of the second bidirectional lead screw 30 passes through the support plate 1 and extends to the outside. A third limiting nut 31 is threadedly connected to the side of the end of the second bidirectional lead screw 30 that extends to the outside.

[0042] In this embodiment, when it is necessary to further adjust the distance between the bearing columns 3 on the two bearing seats 2, the second bidirectional lead screw 30 is rotated. The threads on the second bidirectional lead screw 30 are symmetrical and opposite in direction. Therefore, when the second bidirectional lead screw 30 rotates, it will drive the second slider 28 to slide in opposite directions within the second slide groove 29. The second slider 28 drives the two bearing seats 2 to slide in opposite directions, thereby adjusting the distance between the bearing columns 3 on the two bearing seats 2. After the positions of the two bearing seats 2 are adjusted, the third limiting nut 31 is tightened. The third limiting nut 31 limits and fixes the position of the second bidirectional lead screw 30, thereby improving the overall support range of the device.

[0043] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An adjustable steel support device for cast-in-place box girder portal, comprising a plurality of support units, characterized in that, Each set of support units includes a bearing plate (1), the upper surface of the bearing plate (1) is provided with two symmetrical bearing seats (2), the upper surface of each bearing seat (2) is provided with two symmetrical bearing columns (3), the upper end of each bearing column (3) is provided with a height adjustment unit (4) that can adjust the height, the two adjacent height adjustment units (4) are provided with transverse keels (5), the upper side of each transverse keel (5) is provided with several longitudinal keels (6), the upper side of several longitudinal keels (6) is covered with a casting template (7), the casting template (7) is cast on top of the casting template (7), the side of the two adjacent bearing columns (3) is provided with a telescopic connecting unit (9), each bearing seat (2) is provided with a first adjustment unit (10) for moving the two bearing columns (3) towards each other or away from each other, and the bearing plate (1) is provided with a second adjustment unit (11) for moving the two bearing seats (2) towards each other or away from each other.

2. The adjustable steel bracing device for cast-in-place box beam portal according to claim 1, wherein, The height adjustment unit (4) includes a U-shaped snap-fit ​​bracket (12) above each support column (3) and adapted to the transverse keel (5). A threaded column (13) is fixedly connected to the lower side of the snap-fit ​​bracket (12). The upper end of the support column (3) is provided with a plug groove (14) adapted to the threaded column (13). An adjustment ring (15) is threadedly connected to the side of the threaded column (13).

3. The adjustable steel bracing device for cast-in-place box beam portal according to claim 2, wherein, The adjusting ring (15) is fixedly connected to a limiting ring (16) on its side. The upper end of the bearing column (3) is provided with a limiting groove (17) that is adapted to the limiting ring (16). The upper end of the bearing column (3) is threadedly connected to a limiting bolt (18) whose end abuts against the side of the limiting ring (16).

4. The adjustable steel bracing device for cast-in-place box beam portal according to claim 1, wherein, The connecting unit (9) includes several connecting plates (19) disposed between every two adjacent bearing columns (3). Two symmetrical first connecting rods (20) and second connecting rods (21) are rotatably connected to the two ends of the two connecting plates (19). The first connecting rods (20) and second connecting rods (21) are X-shaped and can rotate. The ends of the first connecting rods (20) and second connecting rods (21) away from the connecting plate (19) are rotatably connected to the side of the bearing column (3) and can be disassembled.

5. The adjustable steel support device for the portal opening of a cast-in-place box girder according to claim 4, characterized in that, A limiting screw (22) passes through between the two connecting plates (19), and the limiting screw (22) has several first limiting nuts (23) threaded to its side for limiting the two connecting plates (19).

6. The adjustable steel bracing device for cast-in-place box beam portal according to claim 1, wherein, The first adjustment unit (10) includes a first slider (24) fixedly connected to the lower end of each bearing column (3). Each bearing seat (2) has a first groove (25) adapted to the first slider (24) on its upper side. A first bidirectional screw (26) is rotatably connected in the first groove (25). The first bidirectional screw (26) passes through the two first sliders (24) and is threadedly connected to the first sliders (24). One end of the first bidirectional screw (26) passes through the bearing seat (2) and extends to the outside. A second limiting nut (27) is threadedly connected to the side of the end of the first bidirectional screw (26) extending to the outside.

7. The adjustable steel bracing device for cast-in-place box beam portal according to claim 1, wherein, The second adjustment unit (11) includes a second slider (28) fixedly connected to the lower side of each support seat (2). The upper surface of the support plate (1) is provided with a second groove (29) adapted to the second slider (28). A second bidirectional screw (30) is rotatably connected in the second groove (29). The second bidirectional screw (30) passes through the two second sliders (28) and is threadedly connected to the second sliders (28). One end of the second bidirectional screw (30) passes through the support plate (1) and extends to the outside. A third limiting nut (31) is threadedly connected to the side of the end of the second bidirectional screw (30) extending to the outside.

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