Movable cast-in-place box girder prestress tensioning operation platform

Abstract

A main body of the movable cast-in-place box girder prestress tensioning operation platform is arranged on a cast-in-place box girder through a hanging bracket, and after construction is finished, the movable cast-in-place box girder prestress tensioning operation platform can be transported to a next construction site. Besides, the main body is provided with a plurality of groups of surrounding rods in the height direction, and the pedal is laid at the bottom of the main body or on the surrounding rods, so that the standing height of the constructor can be adjusted, and the prestressed steel beams with different heights can be tensioned conveniently.

Description

Technical Field

[0001] This utility model belongs to the technical field of prestressed tensioning platform for cast-in-place box girders, and particularly relates to a mobile prestressed tensioning operation platform for cast-in-place box girders. Background Technology

[0002] Traditional prestressed tensioning of cast-in-place box girders often involves erecting a scaffolding platform at the front end of the box girder to the tensioning point. Because the tensioning hydraulic cylinders (or tensioning jacks) are large and heavy, multiple people are needed to place them and complete the tensioning of the prestressed steel bars. Traditional scaffolding or temporary supports are susceptible to wind and vibration, posing a risk of collapse; some platforms lack standardized guardrails, anti-slip footboards, or safety anchor points, resulting in a high rate of worker falls from heights. After tensioning the transverse steel strands within the support area, the support needs to be dismantled, and a new support erected at the next location, repeating the process. This not only results in slow tensioning speed and low construction efficiency but also poses safety hazards and may delay the construction schedule.

[0003] In addition, in mountainous areas, river marshes, and bridge areas, the steel reinforcement of cast-in-place box girders is suspended in the air, making it impossible to construct using scaffolding. Currently, cranes are often used to assist in the installation and dismantling of tensioning hydraulic cylinders. This construction method has disadvantages such as narrow construction area, lack of mechanical operation, repeated horizontal movement of the crane for alignment and placement of tensioning hydraulic cylinders, which is time-consuming, labor-intensive, dangerous, inefficient, wasteful of crane equipment, and slow construction speed. Utility Model Content

[0004] The purpose of this utility model is to provide a mobile prestressed tensioning operation platform for cast-in-place box girders, which is suitable for various construction environments and improves construction safety and efficiency.

[0005] The technical solution of this utility model is as follows:

[0006] A movable prestressing tensioning operation platform for cast-in-place box girders is installed on the cast-in-place box girder, which has multiple sets of prestressing steel strands arranged along its height, including:

[0007] The main body includes a hollow cuboid frame. The side of the cuboid frame closest to the cast-in-place box girder is the construction surface, while the other three sides form non-construction surfaces. The main body is equipped with multiple sets of retaining rods along the height direction, and the retaining rods are horizontally installed on the non-construction surfaces.

[0008] The treadmill is used to support construction workers and tools. The treadmill is laid on the bottom of the cuboid frame or on the surrounding poles.

[0009] The hanger includes two parallel hanger beams spaced apart and two diagonal reinforcing bars. The hanger beams are perpendicular to the construction surface and one end is fixed to the construction surface. The hanger beams are placed on the upper surface of the cast-in-place box girder. The two ends of the diagonal reinforcing bars are respectively connected to the middle section of the hanger beams and the top of the non-construction surface.

[0010] The fixing plate has one or two fixing slots along its length. The fixing plate is perpendicular to the lifting beam and placed horizontally on the two lifting beams.

[0011] The anchoring assembly includes a threaded steel bar and a nut. One end of the threaded steel bar is embedded in the cast-in-place box girder, and the other end passes through the fixing groove and is detachably fixed to the fixing plate, hanger and cast-in-place box girder with the nut.

[0012] In some possible implementations, the movable cast-in-place box girder prestressing tensioning operation platform includes two fixing plates, which are respectively set on both sides of the diagonal stiffener.

[0013] In some possible implementations, the fixing plate has a fixing groove, the distance between the fixing grooves being greater than the distance between the two hanging beams, and the two threaded steel bars fixing the same fixing plate are located on both sides of the hanger.

[0014] In some possible implementations, the fixing plate has two fixing slots, the distance between the opposite ends of the two fixing slots is greater than the distance between the two hanging beams, and the two threaded steel bars fixing the same fixing plate are located on both sides of the hanger.

[0015] In some possible implementations, the distances between the bottom of the cuboid frame and its adjacent rails, the distances between two adjacent sets of rails, and the distances between two adjacent sets of prestressed steel strands are the same in the height direction.

[0016] In some possible implementations, in the height direction, the prestressed steel strands are located between two adjacent sets of retaining bars or between the bottom of the cuboid frame and its adjacent retaining bars.

[0017] In some possible implementations, the main body also includes ladders set along non-construction surfaces.

[0018] In some possible implementations, the main body has hoisting holes on the top of the two opposite sides of the cuboid frame.

[0019] In some possible implementations, the main body also includes a rainproof tarpaulin laid on top of the cuboid frame.

[0020] In some possible implementations, the main body, hanger, fixing plate, and pedal are all made of steel.

[0021] This utility model has at least the following beneficial effects:

[0022] (1) The main body of the movable cast-in-place box girder prestressing tensioning operation platform provided by this utility model is set on the cast-in-place box girder by a hanger. After the construction is completed, the movable cast-in-place box girder prestressing tensioning operation platform can be transported to the next construction site. Compared with the traditional prestressing tensioning operation platform fixed on the ground, it is not necessary to dismantle and rebuild the entire prestressing tensioning operation platform, which can effectively improve the construction efficiency.

[0023] (2) The main body is equipped with multiple sets of railings along its height. By laying the treads on the bottom of the cuboid frame or on the railings, the standing height of the construction workers can be adjusted, which facilitates the tensioning of prestressed steel strands at different heights and improves the tensioning accuracy. The railings above the treads can also serve as a fence to improve construction safety. Attached Figure Description

[0024] Figure 1 A structural diagram of the main body;

[0025] Figure 2 A schematic diagram of the front structure of a mobile cast-in-place box girder prestressing tensioning operation platform;

[0026] Figure 3 A schematic diagram of the rear structure of a mobile cast-in-place box girder prestressing tensioning operation platform;

[0027] Figure 4 for Figure 3 Enlarged view of A in the middle;

[0028] Figure 5 This is a schematic diagram showing the positional relationship between the movable cast-in-place box girder prestressing tensioning operation platform and the cast-in-place box girder;

[0029] Figure 6 for Figure 5 Enlarged view of B in the middle;

[0030] Figure 7 This is a schematic diagram showing the positional relationship between the movable cast-in-place box girder prestressing tensioning operation platform and the cast-in-place box girder;

[0031] Figure 8 for Figure 7 A magnified view of C.

[0032] The reference numerals in the diagram are as follows: 1-Main body, 11-Cuboid frame, 12-Walling, 121-Steel pipe, 13-Ear, 131-Lifting hole, 14-Ladder, 2-Hanger, 21-Lifting beam, 22-Diagonal reinforcing bar, 23-Horizontal reinforcing bar, 3-Fixing plate, 31-Fixing groove, 41-Threaded steel bar, 42-Nut, 43-Washer, 5-Step, 6-Cast-in-place box girder, 61-Prestressed steel strand. Detailed Implementation

[0033] The technical solution of this utility model will be further explained and described below through specific embodiments.

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are preferred embodiments of the present utility model and should not be considered as excluding other embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] Unless otherwise expressly defined, in the claims, description and accompanying drawings of this utility model, the use of directional terms such as "top", "bottom", "inner", "outer", "upper", "lower", "front", "rear" to indicate orientation or positional relationship is based on the orientation and positional relationship shown in the accompanying drawings, and is only for the convenience of describing this utility model and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the specific protection scope of this utility model.

[0036] Example 1

[0037] This embodiment provides a movable prestressed tensioning operation platform for cast-in-place box girder 6. First, refer to... Figures 1-4 The movable cast-in-place box girder 6 prestressed tensioning platform includes a main body 1, a hanger 2, two fixing plates 3, an anchoring assembly, and a footboard 5.

[0038] like Figure 1 As shown, the main body 1 includes a cuboid frame 11 with a height of 4.5m, a length of 1.4m, and a width of 1.2m, formed by welding multiple sections of 12# I-beams. One side of the cuboid frame 11 is the construction surface, and the other three sides form non-construction surfaces.

[0039] The main body 1 is equipped with five sets of retaining rods 12 along its height. Each set of retaining rods 12 includes three steel pipes 121 (φ48×3.5mm), which are horizontally arranged at the same height on one side of the non-construction surface. In the height direction, the distance between the bottom of the cuboid frame 11 and its adjacent retaining rods 12, the distance between two adjacent sets of retaining rods 12, and the distance between two adjacent sets of prestressed steel strands 61 are the same. In this embodiment, this distance is 0.6m. Furthermore, in the height direction, as... Figure 5 and Figure 6 As shown, the prestressed steel strands 61 are located between two adjacent sets of retaining rods 12 or between the bottom of the cuboid frame 11 and its adjacent retaining rods 12.

[0040] The length of the tread plate 5 is greater than the length of the cuboid frame 11. It is erected at the bottom of the cuboid frame 11 or on any set of railings 12 as needed for construction. Construction personnel and the construction tools required for tensioning can tension the prestressed steel strands 61 on the tread plate 5.

[0041] The hanger 2 includes two parallel and spaced-apart hanging beams 21 and two diagonal reinforcing bars 22. In this embodiment, the hanging beams 21 are formed by welding two 1.5m long 20# channel steels together, while the diagonal reinforcing bars 22 are made of 12# channel steel. The hanging beams 21 are perpendicular to the construction surface, with one end welded to a point 3.2m above the construction surface. The two ends of the diagonal reinforcing bars 22 are connected to the middle section of the hanging beams 21 and the top of the non-construction surface, respectively, to enhance the structural stability of the hanger 2. In this embodiment, the two hanging beams 21 are connected by a horizontal reinforcing bar 23 (12# channel steel) to further enhance their structural stability.

[0042] The fixing plate 3 is formed by welding two 2m long No. 12 channel steels back to back, with two fixing grooves 31 arranged along the length direction in the middle. The width of the fixing grooves 31 is 32mm, and the distance between the back ends of the two fixing grooves 31 is 1.5m, which is greater than the distance between the two hanging beams 21. The fixing plate 3 is perpendicular to the hanging beams 21 and placed horizontally on the two hanging beams 21, and the two fixing plates 3 and the two hanging beams 21 form a grid structure.

[0043] See Figure 4 The anchoring assembly includes four threaded steel bars 41 (φ32 precision-rolled threaded steel bars) and matching nuts 42, which are fitted with the hanger 2 via fixing slots 31. Specifically, as shown... Figure 7 and Figure 8 As shown, one end of the threaded steel bar 41 is embedded in the cast-in-place box girder 6, and the other end passes through the fixing groove 31 and is detachably fixed to the fixing plate 3, the hanger 2, and the cast-in-place box girder 6 by cooperating with the nut 42. Specifically, in this embodiment, a φ40 PVC pipe is pre-embedded above the cast-in-place box girder 6 as a reserved hole for the threaded steel bar 41 (not shown in the figure), and one end of the threaded steel bar 41 is embedded in the cast-in-place box girder 6 through the reserved hole; a washer 43 is also provided between the nut 42 and the fixing plate 3 to improve the stability of the connection.

[0044] Furthermore, in this embodiment, two lugs are welded to the top of two opposite sides of the cuboid frame 11 of the main body 1. Lifting holes are provided on the lugs, allowing a crane to lift and move the main body 1 and the hanger 2 through these holes. A ladder 14 is provided along the height direction on one side of the main body 1 that is not part of the construction surface, facilitating movement of construction personnel. In other possible embodiments, a rainproof tarpaulin can also be provided on the top of the cuboid frame 11 to improve the safety of construction personnel in inclement weather.

[0045] The operating method of the movable cast-in-place box girder prestressing tensioning operation platform is as follows:

[0046] First, the main body 1 and the hanger 2 are welded and assembled. A φ40 PVC pipe is used to pre-embed a φ32 precision-rolled threaded steel bar 41 at the top plate position of the cast-in-place box girder 6. After the cast-in-place box girder 6 reaches the prestressing tensioning condition, a truck crane or crawler crane is used to hoist the main body 1 and hanger 2 of the movable cast-in-place box girder 6 prestressing tensioning operation platform as a whole, so that the bottom of the hanger beam 21 contacts the upper surface of the cast-in-place box girder 6. Two fixing plates 3 are perpendicular to the hanger beam 21 and horizontally placed above the two hanger beams 21 to form a grid structure. Specifically, the two fixing plates 3 are located on both sides of the inclined reinforcing bar 22, and the threaded steel bar 41 passes through the fixing groove 31 to position the fixing plates 3. Then, the nut 42 engages with the threaded steel bar 41 from above the fixing plates 3 to fix the fixing plates 3, the hanger 2, and the cast-in-place box girder 6, completing the installation of the movable cast-in-place box girder 6 prestressing tensioning operation platform. Then, according to the height of the tensioning holes, stepping stones 5 are laid at the bottom of the cuboid frame 11 or on the surrounding rods 12 as a standing platform for the workers, and then the installation of jacks, prestressing tensioning and other operations are carried out. During the tensioning of the prestressed steel strands 61 hole by hole, the movable cast-in-place box girder 6 prestressing tensioning operation platform does not need to be adjusted except for the stepping stones 5. The tensioning of all prestressed steel strands 61 can be achieved by adjusting the position of the stepping stones 5 according to the height position of the prestressed steel strands 61.

[0047] After construction is completed, remove the fixing plate 3 and the anchoring components, and then hoist the main body 1 and the hanger 2 to the next construction site.

[0048] The above description is only a preferred embodiment of the present utility model, and therefore cannot be used to limit the scope of the present utility model. All equivalent changes and modifications made in accordance with the scope of the present utility model patent and the contents of the specification should still fall within the scope of the present utility model.

Claims

1. A movable prestressed tensioning operation platform for cast-in-place box girders, mounted on a cast-in-place box girder, wherein the cast-in-place box girder is provided with multiple sets of prestressed steel strands along its height direction, characterized in that, include: The main body includes a hollow cuboid frame. The side of the cuboid frame closest to the cast-in-place box girder is the construction surface, and the other three sides form non-construction surfaces. The main body is provided with multiple sets of surrounding rods along the height direction, and the surrounding rods are horizontally arranged around the non-construction surfaces. The treadmill is used to support construction workers and tools, and the treadmill is laid on the bottom of the cuboid frame or on the surrounding pole; The hanger includes two parallel hanger beams spaced apart and two diagonal reinforcing bars. The hanger beams are perpendicular to the construction surface and one end is fixed to the construction surface. The hanger beams are placed on the upper surface of the cast-in-place box girder. The two ends of the diagonal reinforcing bars are respectively connected to the middle section of the hanger beams and the top of the non-construction surface. A fixing plate is provided with one or two fixing grooves in the length direction. The fixing plate is perpendicular to the lifting beam and placed horizontally on the two lifting beams. An anchoring assembly includes a threaded steel bar and a nut, one end of which is embedded in the cast-in-place box girder, and the other end passes through the fixing groove and is engaged with the nut to detachably fix the fixing plate, the hanger, and the cast-in-place box girder.

2. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1, characterized in that, It includes two fixing plates, which are respectively disposed on both sides of the inclined reinforcing rod.

3. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1 or 2, characterized in that, The fixing plate has a fixing groove, the distance between the fixing grooves is greater than the distance between the two hanging beams, and the two threaded steel bars fixing the same fixing plate are respectively located on both sides of the hanger; Alternatively, the fixing plate has two fixing slots, the distance between the opposite ends of the two fixing slots is greater than the distance between the two hanging beams, and the two threaded steel bars fixing the same fixing plate are located on both sides of the hanger.

4. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1, characterized in that, In the height direction, the distance between the bottom of the cuboid frame and the adjacent surrounding rod, the distance between two adjacent sets of surrounding rods, and the distance between two adjacent sets of prestressed steel strands are the same.

5. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 4, characterized in that, In the vertical direction, the prestressed steel strands are located between two adjacent sets of retaining bars or between the bottom of the cuboid frame and the retaining bars adjacent to it.

6. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1, characterized in that, The main body also includes a ladder installed along the non-construction surface.

7. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1, characterized in that, The main body has lifting holes on the top of the two opposite sides of the cuboid frame.

8. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1, characterized in that, The main body also includes a rainproof cloth laid on top of the cuboid frame.

9. The movable cast-in-place box girder prestressing tensioning operation platform as described in claim 1, characterized in that, The main body, the hanger, the fixing plate, and the pedal are all made of steel.

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