A method for fabricating box girder joints for large-section W-shaped truss bridges

Abstract

This invention discloses a method for fabricating box girder nodes for large-section W-shaped truss bridges. The method includes selecting segmentation locations for the box girder nodes; creating drawings, laying out materials, and beveling the segmented W-shaped truss bridge box girder node sub-components; assembling them; and performing pre-assembly dimensional checks on the welded W-shaped truss bridge box girder node sub-components to ensure that the pre-assembled spatial dimensions match the spatial dimensions of the W-shaped truss bridge box girder node before segmentation, thus guaranteeing that the segmented node sub-components meet the original design requirements. This invention solves the problems of large-section W-shaped truss bridge box girder nodes being difficult to fabricate, transport, and install due to their large spatial dimensions. By fabricating the large-section W-shaped truss bridge box girder nodes in segments, the overall weight of the component is reduced, eliminating safety hazards associated with hoisting heavy components, and facilitating the construction of segmented fabrication, transportation, and installation of heavy, irregularly shaped components.

Description

Technical Field

[0001] This invention relates to the field of steel structure building technology, specifically a method for fabricating box girder nodes for large-section W-shaped truss bridges. Background Technology

[0002] Steel structures are widely used in the construction industry due to their advantages of light weight and high strength, and are particularly favored in the field of modern pedestrian bridges. This has led to the development of a large-section W-shaped truss bridge box girder joint. The connection structure of the large-section W-shaped truss bridge box girder joint is shown in the attached figure. Figure 1 As shown, its main body's two side ends are connected to the chord members, the central wall panel is connected to the crossbeam, the W-shaped middle end is connected to the column, and the W-shaped side ends are connected to the diagonal braces. Therefore, the large-section W-shaped truss bridge box girder node has strong connection performance and can connect multiple member systems with its unique structural construction, making it the preferred connection node for designers in the field of truss bridges. However, due to its unique connection position, this type of W-shaped truss bridge box girder node inevitably has the characteristics of large cross-sectional dimensions and large component tonnage, making traditional factory processing, road transportation, and on-site hoisting difficult to handle these characteristics. Summary of the Invention

[0003] The purpose of this invention is to overcome the above-mentioned defects and propose a method for manufacturing large-section W-shaped truss girder box girder nodes that can solve the problems of large spatial dimensions making it difficult to manufacture, transport, and install.

[0004] To achieve the above objectives, the present invention is implemented as follows:

[0005] A method for fabricating a box girder joint for a large-section W-shaped truss bridge: including

[0006] Step 1: Select the segmentation positions for the box girder nodes of the large cross-section W-shaped truss bridge to ensure that the size and weight of the sub-components after segmentation can meet the actual capabilities of factory processing, road transportation and on-site hoisting, and obtain the approval of the design unit.

[0007] Step 2: Draw the sub-components of the box girder of the segmented W-shaped truss bridge. The factory will carry out pre-assembly preparation work such as layout and cutting of materials and beveling according to the characteristics of the segmented parts.

[0008] Step 3: Assembly;

[0009] Step 3.1: Temporarily fix the main body base plate and wall panel of the segmented sub-component together by spot welding;

[0010] Step 3.2: Then assemble the base plate and wall panel with the stiffening ribs connected to them respectively. After assembly, weld them together by reverse deformation to form the base plate unit.

[0011] Step 3.3: Next, assemble the partition unit and the base plate unit in sequence, and assemble the wall panel unit with the base plate and partition unit in sequence;

[0012] Step 3.4: Finally, assemble all the remaining top parts of the W-shaped node.

[0013] Step 3.5: After assembly, check the overall dimensions of the box girder node of the entire W-shaped truss bridge. After the dimensions are qualified, perform symmetrical welding on the welds. Take anti-deformation measures during the welding process and formulate reasonable welding parameters and welding sequence. After welding, check the overall dimensions of the node a second time. After the dimensions are qualified, disassemble the bottom plate and wall plate that are spot-welded together, so that each segmented sub-component is in a free state without external force constraints, and prepare for the pre-assembly of the sub-components.

[0014] Step 4: Perform a pre-assembly dimension check on the box-type node sub-components of the W-shaped truss bridge after welding, and adjust them to ensure that the pre-assembly spatial dimensions of the box-type node of the W-shaped truss bridge are consistent with the spatial dimensions of the box-type node of the W-shaped truss bridge before segmentation, that is, ensure that the spatial dimensions of the node sub-components after segmentation are consistent with the original design requirements.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. This method can solve the problem of large cross-section W-shaped truss bridge box girder nodes being difficult to manufacture, transport, and install due to their large spatial dimensions. By dividing the large cross-section W-shaped truss bridge box girder nodes into sections for drawing, cutting, assembly, welding, and pre-assembly, it can achieve both the operability of component manufacturing and ensure that the overall dimensions meet the requirements.

[0017] 2. This method can solve the problem of large-section W-shaped truss bridge box girder nodes being difficult to manufacture, transport, and install due to their large tonnage. By manufacturing large-section W-shaped truss bridge box girder nodes in sections, the weight of the entire component is reduced, the safety hazards of hoisting large-tonnage components are eliminated, and the construction of large-tonnage irregular components can be made convenient for segmented manufacturing, transportation, and installation. Attached Figure Description

[0018] Figure 1 This is a flowchart illustrating the process of creating this method.

[0019] Figure 2 This is a schematic diagram of the node structure. Detailed Implementation

[0020] The present invention will be further illustrated below through specific embodiments.

[0021] like Figure 1 , Figure 2 As shown, a method for fabricating a box girder joint for a large-section W-shaped truss bridge includes:

[0022] Step 1: Select the segmentation positions for the box girder nodes of the large cross-section W-shaped truss bridge to ensure that the size and weight of the sub-components after segmentation can meet the actual capabilities of factory processing, road transportation and on-site hoisting, and obtain the approval of the design unit.

[0023] Step 2: Draw the sub-components of the box girder of the segmented W-shaped truss bridge. The factory will carry out pre-assembly preparation work such as layout and cutting of materials and beveling according to the characteristics of the segmented parts.

[0024] Step 3: Assembly;

[0025] Step 3.1: Temporarily fix the main body base plate and wall panel of the segmented sub-component together by spot welding;

[0026] Step 3.2: Then assemble the base plate and wall panel with the stiffening ribs connected to them respectively. After assembly, weld them together by reverse deformation to form the base plate unit.

[0027] Step 3.3: Next, assemble the partition unit and the base plate unit in sequence, and assemble the wall panel unit with the base plate and partition unit in sequence;

[0028] Step 3.4: Finally, assemble all the remaining top parts of the W-shaped node.

[0029] Step 3.5: After assembly, check the overall dimensions of the box girder node of the entire W-shaped truss bridge. After the dimensions are qualified, perform symmetrical welding on the welds. Take anti-deformation measures during the welding process and formulate reasonable welding parameters and welding sequence. After welding, check the overall dimensions of the node a second time. After the dimensions are qualified, disassemble the bottom plate and wall plate that are spot-welded together, so that each segmented sub-component is in a free state without external force constraints, and prepare for the pre-assembly of the sub-components.

[0030] Step 4: Perform a pre-assembly dimension check on the box-type node sub-components of the W-shaped truss bridge after welding, and adjust them to ensure that the pre-assembly spatial dimensions of the box-type node of the W-shaped truss bridge are consistent with the spatial dimensions of the box-type node of the W-shaped truss bridge before segmentation, that is, ensure that the spatial dimensions of the node sub-components after segmentation are consistent with the original design requirements.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] 1. This method can solve the problem of large cross-section W-shaped truss bridge box girder nodes being difficult to manufacture, transport, and install due to their large spatial dimensions. By dividing the large cross-section W-shaped truss bridge box girder nodes into sections for drawing, cutting, assembly, welding, and pre-assembly, it can achieve both the operability of component manufacturing and ensure that the overall dimensions meet the requirements.

[0033] 2. This method can solve the problem of large-section W-shaped truss bridge box girder nodes being difficult to manufacture, transport, and install due to their large tonnage. By manufacturing large-section W-shaped truss bridge box girder nodes in sections, the weight of the entire component is reduced, the safety hazards of hoisting large-tonnage components are eliminated, and the construction of large-tonnage irregular components can be made convenient for segmented manufacturing, transportation, and installation.

Claims

1. A method for fabricating a box girder joint for a large-section W-shaped truss bridge, characterized by: include Step 1: Select the segmentation positions for the box girder nodes of the large cross-section W-shaped truss bridge to ensure that the size and weight of the sub-components after segmentation can meet the actual capabilities of factory processing, road transportation and on-site hoisting, and obtain the approval of the design unit. Step 2: Draw the sub-components of the box girder of the segmented W-shaped truss bridge. The factory will carry out pre-assembly preparation work such as layout and cutting of materials and beveling according to the characteristics of the segmented parts. Step 3: Assembly; Step 3.1: Temporarily fix the main body base plate and wall panel of the segmented sub-component together by spot welding; Step 3.2: Then assemble the base plate and wall panel with the stiffening ribs connected to them respectively. After assembly, weld them together by reverse deformation to form the base plate unit. Step 3.3: Next, assemble the partition unit and the base plate unit in sequence, and assemble the wall panel unit with the base plate and partition unit in sequence; Step 3.4: Finally, assemble all the remaining top parts of the W-shaped node. Step 3.5: After assembly, check the overall dimensions of the box girder node of the entire W-shaped truss bridge. After the dimensions are qualified, perform symmetrical welding on the welds. Take anti-deformation measures during the welding process and formulate reasonable welding parameters and welding sequence. After welding, check the overall dimensions of the node a second time. After the dimensions are qualified, disassemble the bottom plate and wall plate that are spot-welded together, so that each segmented sub-component is in a free state without external force constraints, and prepare for the pre-assembly of the sub-components. Step 4: Perform a pre-assembly dimension check on the box-type node sub-components of the W-shaped truss bridge after welding, and adjust them to ensure that the pre-assembly spatial dimensions of the box-type node of the W-shaped truss bridge are consistent with the spatial dimensions of the box-type node of the W-shaped truss bridge before segmentation, that is, ensure that the spatial dimensions of the node sub-components after segmentation are consistent with the original design requirements.

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