Precise positioning node of steel box girder

Abstract

The utility model discloses a steel box girder fine positioning node which comprises a first positioning piece arranged on the right side of the top face of a lower bottom plate of a first steel box girder in the width direction of the steel box girder, a plurality of second positioning pieces parallel to the first positioning piece are arranged on the right side of the first positioning piece, and the second positioning pieces are provided with guide grooves perpendicular to the lower bottom plate of the first steel box girder. The third positioning piece extends in the length direction of the steel box girder and is arranged on the left side of the top face of a lower bottom plate of the second steel box girder, an inverted-Y-shaped bayonet with the depth matched with the height of the first positioning piece is formed in the lower portion of the third positioning piece, and the distance between the inverted-Y-shaped bayonet and the left end face of the second steel box girder is matched with the distance between the first positioning piece and the right end face of the first steel box girder; the height of the first positioning piece is smaller than that of the third positioning piece, and the height of the third positioning piece is smaller than or equal to that of the second positioning piece. According to the utility model, the steel box girder can be accurately positioned, and the assembly efficiency of the steel box girder bridge is improved.

Description

Technical Field

[0001] This utility model relates to the field of bridge construction technology, specifically to a node for precise positioning of steel beams. Background Technology

[0002] With the rapid development of modern transportation infrastructure, steel box girder bridges have become the preferred solution for the construction of long-span bridges due to their high strength, high stability, and lightweight characteristics. Especially when crossing ecologically sensitive waters, their light weight can significantly reduce the load on bridge pier foundations and minimize disturbance to the aquatic ecosystem. Furthermore, the modular construction method of steel box girder bridges, with factory prefabrication and on-site assembly working in tandem, can significantly improve construction efficiency.

[0003] Precise alignment of steel box girder segments is a key technical bottleneck during construction. Due to the large size of individual segments, spatial positioning accuracy is difficult to control during hoisting, often requiring repeated adjustments. Traditional methods rely on manual operation (such as total station measurement and hydraulic jacking), which not only prolongs high-altitude work time and increases safety risks but also significantly reduces the construction efficiency of steel box girder bridges. Chinese utility model patent CN215976865U proposes an alignment and matching component for inter-segment steel box girder bridges, which is installed above the joint between two steel box girders. The component includes angle steel blocks, positioning pins, bolts, and mounting plates: the horizontal portion of the angle steel block is welded to the steel box girder, and a pin hole is located in the center of the vertical portion of the angle steel block, with bolt holes on both horizontal sides beside the pin hole. The two angle steel blocks are fixed by positioning pins and bolts; several mounting plates are also welded along the top of the joint between the steel box girders. This solution reduces some adjustment steps by using angle steel blocks, positioning pins, and bolts for positioning. However, it still relies on manual installation of pins and bolts, which is inconvenient. Furthermore, gaps exist in the bolt connections, and repeated disassembly and assembly can accumulate errors, affecting the bridge's alignment. Utility Model Content

[0004] This utility model proposes a precision positioning node for steel box girders, the purpose of which is to solve the problems of inconvenience and low efficiency in positioning due to the need for manual installation of positioning pins, bolts and other connecting parts in existing positioning nodes.

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

[0006] A precision positioning node for a steel box girder includes a first positioning component disposed on the right side of the top surface of the bottom plate of the first steel box girder along the width direction of the steel box girder. Multiple second positioning components parallel to the first positioning component are disposed on the right side of the first positioning component. A guide groove perpendicular to the bottom plate of the first steel box girder is disposed in the middle of each second positioning component. The node also includes a third positioning component extending along the length direction of the steel box girder and disposed on the left side of the top surface of the bottom plate of the second steel box girder. The lower part of the third positioning component has an inverted Y-shaped notch with a depth matching the height of the first positioning component. The distance between the inverted Y-shaped notch and the left end face of the second steel box girder is L1, and the distance between the first positioning component and the right end face of the first steel box girder is L2, where L1 = L2. The height of the first positioning component is less than the height of the third positioning component, and the height of the third positioning component is less than or equal to the height of the second positioning components.

[0007] As a further improvement of this utility model, the second positioning member includes two positioning plates symmetrically arranged on the front and rear sides of the third positioning member. The upper inner side of the positioning plate is provided with a chamfer, and the inclined surface of the chamfer forms a Y-shaped guide groove with the inner end face of the positioning plate.

[0008] As a further improvement of this utility model, a reinforcing member is fixed to the right end of the third positioning member, which is a rib plate fixed to the front and rear sides of the third positioning member respectively.

[0009] As a further improvement of this utility model, the third positioning element is also provided with an arc-shaped welding hole.

[0010] Compared with the prior art, the present invention has the following advantages:

[0011] (1) This utility model achieves lateral positioning by interlocking the Y-shaped guide groove of the second positioning component with the plate of the third positioning component, and achieves longitudinal positioning by interlocking the inverted Y-shaped slots of the first and third positioning components. It can quickly complete bidirectional precise positioning without the need for other connecting components, reducing manual intervention and high-altitude fastening operations, and improving construction efficiency by more than 40%. Combined with the height difference constraint of the first, second and third positioning components, it ensures that the misalignment of the two steel box girders along the width direction of the steel box girder is ≤1.5mm and the gap along the length direction of the steel box girder is ≤2mm, avoiding repeated adjustments and improving the accuracy of bridge alignment by 50%.

[0012] (2) By adding double-sided ribs as reinforcements on the right side of the third positioning member, the shear bearing capacity can be increased by 30%. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the positioning node in an embodiment of the present invention;

[0014] Figure 2 This is a schematic elevation view of the positioning node in an embodiment of this utility model;

[0015] Figure 3This is an exploded view of the positioning node in an embodiment of this utility model;

[0016] Figure 4 This is a schematic diagram of the elevation structure of the second positioning component;

[0017] Figure 5 This is a schematic diagram of the elevation structure of the third positioning component.

[0018] Explanation of reference numerals in the attached drawings: 1. First positioning component; 2. Second positioning component; 3. Third positioning component; 31. Inverted Y-shaped bayonet; 4. Reinforcing component; 5. First steel box girder; 6. Second steel box girder. Detailed Implementation

[0019] The technical solution and effects of this utility model will be described in detail below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0020] like Figure 1 , Figure 2 and Figure 3 As shown, a precision positioning node for a steel box girder includes a first positioning component 1 disposed on the right side of the top surface of the bottom plate of the first steel box girder 5 along the width direction (i.e., transverse direction). Multiple second positioning components 2, parallel to the first positioning component 1, are welded to the right side of the first positioning component 1. Combined with... Figure 4 As shown, the second positioning element 2 includes positioning plates symmetrically arranged on the front and rear sides of the third positioning element 3. The upper inner side of each positioning plate has a chamfer, and the beveled surface of the chamfer forms a Y-shaped guide groove with the inner side of the positioning plate. Combined with... Figure 5 As shown, this application also includes a third positioning member 3 extending along the length direction (i.e., longitudinally) of the steel box girder and disposed on the left side of the top surface of the bottom plate of the second steel box girder 6. The lower left end of the third positioning member 3 has an inverted Y-shaped notch 31 with a depth matching the height of the first positioning member 1. Let L1 be the distance between the inverted Y-shaped notch 31 and the left end face of the second steel box girder 6, and L2 be the distance between the first positioning member 1 and the right end face of the first steel box girder 5, where L1 = L2. The bottom of the third positioning member 3 also has an arc-shaped weld hole for easy welding. (See attached image) Figure 2 As shown, the height of the first positioning member 1 is less than the height of the third positioning member 3, and the height of the third positioning member 3 is less than or equal to the height of the second positioning member 2. Further, a reinforcing member 4 is welded to the right end of the third positioning member 3 to strengthen its connection with the lower bottom plate of the second steel box girder 6. The reinforcing member 4 consists of ribs welded and fixed to the front and rear sides of the third positioning member 3 respectively.

[0021] The following example illustrates the assembly method of this node in this embodiment:

[0022] First, after the steel box girder is processed, it needs to be pre-assembled in the workshop before being transported to the site for hoisting. In this embodiment, after the two steel box girder sections are pre-assembled, the operators weld the positioning components inside the steel box girder to the corresponding positions on the first steel box girder 5 and the second steel box girder 6. During welding, the first positioning component 1 is first welded to the first steel box girder 5, then the inverted Y-shaped latch 31 of the third positioning component 3 is engaged with the first positioning component 1, then the third positioning component 3 is firmly welded to the second steel box girder 6, and the reinforcing component 4 is welded to the front and rear sides of the third positioning component 3. Finally, the two positioning plates of the second positioning component 2 are welded to the front and rear sides of the third positioning component 3, so that the inner surfaces of the two positioning plates are in close contact with the third positioning component 3. To facilitate positioning, a chamfer is provided on the upper inner side of the second positioning component 2. After the two positioning plates are fixed, a Y-shaped guide groove is formed in the middle. After welding is completed, the two steel box girder sections are separated and marked.

[0023] During on-site hoisting, the first steel box girder 5 is positioned first to ensure its spatial accuracy before hoisting the second steel box girder 6 into place. During descent, the second steel box girder 6 is adjusted so that the Y-shaped guide groove of the third positioning component 3 aligns with that of the second positioning component 2, and the upper end of the inverted Y-shaped latch 31 of the third positioning component 3 coincides with the upper end of the first positioning component 1, thereby achieving precise alignment between the first steel box girder 5 and the second steel box girder 6.

[0024] It should be noted that, as will be apparent to those skilled in the art, this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this utility model. The scope of this utility model is defined by the claims rather than the foregoing description.

Claims

1. A precision positioning node for steel box girders, characterized in that: The first positioning component (1) is set on the right side of the top surface of the bottom plate of the first steel box girder (5) along the width direction of the steel box girder. Multiple second positioning components (2) are set on the right side of the first positioning component (1) and parallel to it. The second positioning component (2) has a guide groove in the middle that is perpendicular to the bottom plate of the first steel box girder (5). The third positioning component (3) is set on the left side of the top surface of the bottom plate of the second steel box girder (6) along the length direction of the steel box girder. The lower part of the third positioning component (3) has an inverted Y-shaped slot (31) with a depth matching the height of the first positioning component (1). The distance between the inverted Y-shaped slot (31) and the left end face of the second steel box girder (6) is L1, and the distance between the first positioning component (1) and the right end face of the first steel box girder (5) is L2, L1=L2. The height of the first positioning component (1) is less than the height of the third positioning component (3), and the height of the third positioning component (3) is less than or equal to the height of the second positioning component (2).

2. The precision positioning node for steel box girders as described in claim 1, characterized in that: The second positioning component (2) includes two positioning plates symmetrically arranged on the front and rear sides of the third positioning component (3). The upper inner side of the positioning plate is chamfered, and the chamfered surface forms a Y-shaped guide groove with the inner end face of the positioning plate.

3. The precision positioning node for steel box girders as described in claim 1, characterized in that: The right end of the third positioning member (3) is fixed with a reinforcing member (4), which is a rib plate fixed on the front and rear sides of the third positioning member (3).

4. The precision positioning node for steel box girders as described in claim 1 or 3, characterized in that: The third positioning component (3) is also provided with an arc-shaped welding hole.

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