Double-chamber grid-reinforced box-section curved steel member and manufacturing method thereof

Abstract

The present invention relates to the field of steel member engineering, and more specifically, to a double-chamber grid-stiffened box-section curved steel member and a manufacturing method, comprising the following steps: S100: obtaining curved steel member parameters, inputting them into a design system, establishing a BIM parametric model of the curved steel member, and generating a gradient stiffening rib scheme for the curved steel member based on the BIM parametric model; S200: obtaining raw materials according to the processing scheme; S300: bending and welding the raw materials to obtain a curved steel member having an outer chamber and an inner chamber, wherein the inner chamber has longitudinal and transverse ribs that are staggered and gradiently distributed within the inner cavity; S400: determining whether the curved steel member is qualified through digital twinning. If qualified, the member is stored; if unqualified, the member returns to S100 to re-establish the BIM parametric model. The present invention effectively solves the asymmetric stress problem of curved members through a double-chamber cross-section separation design combined with the synergistic strengthening effect of orthogonal grid stiffening ribs.

Description

Technical Field

[0001] The present invention relates to the technical field of steel structure engineering, and in particular to a double-chamber grid-reinforced box-section curved steel member and a manufacturing method thereof. Background Art

[0002] With the deep integration of digital construction technology and architectural aesthetics, numerous uniquely shaped and innovative curved buildings are emerging. Traditional structures, which use straight rods to fit curves, often struggle to directly express the architectural aesthetics of spatial curves through structural components. However, the use of curved components provides a practical approach to this goal.

[0003] As the core load-bearing unit for realizing complex curved surface shapes, the bearing performance and stability control of curved steel components have become the key technical bottlenecks restricting architectural innovation design and structural safety. Figure 6 As shown in the figure, the traditional single-chamber design for curved steel members has the following inherent defects under axial compression conditions:

[0004] (1) Asymmetric force and imbalance of material performance:

[0005] The curvature of curved components leads to significant asymmetry in cross-sectional stress distribution. Under the combined effects of axial compression and bending moment, the inner panels first enter the plastic stage or undergo local buckling due to stress concentration, while the outer panels remain in an elastic state. This unbalanced load reduces the overall component's bearing capacity to only 60%-75% of the material's theoretical bearing capacity, resulting in low steel strength utilization.

[0006] (2) Deterioration of stability caused by curvature effect:

[0007] The geometric relationship between curvature radius and cross-sectional dimensions directly influences the buckling mode of a component. The bidirectional curvature of a curved box-shaped component induces coupled buckling, reducing its overall stability coefficient compared to a straight member of the same cross-section. Furthermore, the curved plate's sensitivity to external deformation under normal pressure increases significantly, leading to a significant decrease in its local stability capacity.

[0008] (3) Mismatch between structural form and load-bearing requirements:

[0009] The stiffening rib arrangement principle for symmetrical box sections in current specifications is difficult to adapt to the stress and deformation characteristics of curved members.

[0010] Existing technical improvements, such as the Anti-Local Buckling Stiffener Structure and Design Method (CN 120006835 A), primarily address the local buckling of plate members in box-type straight bars; and a Bending-Torsion Box-Section Component and Manufacturing Process (CN 103056616 A), incorporate stiffening ribs within the box-section to ensure the member's robustness. None of these existing technologies or improvements systematically address the inherent contradiction between stress gradient distribution and structural compatibility in curved components. In particular, for components with significant initial curvature (e.g., >L / 100), these solutions still face technical drawbacks such as poor axial compressive stability and local buckling of the inner plate. Summary of the Invention

[0011] The object of the present invention is to provide a double-chamber grid-reinforced box-section curved steel member and a manufacturing method thereof, so as to solve the problems existing in the background technology.

[0012] In order to solve the above technical problems, the present invention adopts the following solutions:

[0013] A method for manufacturing a double-chamber grid-stiffened box-section curved steel member comprises the following steps:

[0014] S100: Obtain parameters of the curved steel member, input them into the design system, establish a BIM parametric model of the curved steel member, and generate a gradient stiffening rib scheme for the curved steel member based on the BIM parametric model;

[0015] S200: Obtain raw materials according to the processing plan;

[0016] S300: Bending and welding the raw materials to obtain a curved steel member having an outer compartment and an inner compartment, wherein the inner compartment has longitudinal ribs and transverse ribs that are staggered and distributed in a gradient pattern;

[0017] S400: Use digital twins to determine whether the curved steel member is qualified. If qualified, it is put into storage. If unqualified, it returns to S100 to re-establish the BIM parametric model.

[0018] Optionally, S100 also includes:

[0019] S101: Start the design system and initialize the parameter input interface;

[0020] S102: Input the geometric parameters and material parameters of the curved steel member. The geometric parameters include the curvature radius R of the curved steel member, the cross-sectional height h of the outer compartment and the inner compartment, and the arc length L of the curved steel member. The material parameters include the steel grade.

[0021] S103: Curvature sensitivity analysis: R / h < 10 is a high-risk area, and R / h ≥ 10 is a low-risk area;

[0022] S104: If it is a high-risk area, finite element reverse optimization is used to output the stiffening rib parameters, including longitudinal rib spacing and transverse rib spacing;

[0023] S105: If it is a low-risk area, directly call the standard preset parameters of the longitudinal rib spacing and the transverse rib spacing stored in the database, the longitudinal rib spacing;

[0024] S106: Generate a gradient stiffening rib solution and output a DXF processing file and a process parameter table.

[0025] Optionally, the S200 also includes:

[0026] S201: Laser cutting blanking;

[0027] S202: 3D laser positioning;

[0028] S203: Use multi-axis linkage plate bending to bend the plates of the inner and outer cabins;

[0029] S204: Sheet forming inspection;

[0030] S205: Dynamic compensation adjustment is triggered when the error threshold of the sheet forming detection is greater than the error threshold.

[0031] Optionally, the S300 also includes:

[0032] S301: If the error is less than or equal to the plate forming detection error threshold, perform segmented variable curvature bending, with the number of segments n=R / 2h;

[0033] S302: Bending die calibration;

[0034] S303: Rebound detection;

[0035] S304: Electromagnetic restraint, triggered when the error is greater than the rebound detection threshold;

[0036] S305: The longitudinal ribs and transverse ribs are assembled, triggered at an error threshold equal to or less than the springback detection threshold, and welded to the inner cabin inner side panels;

[0037] S306: Temperature detection. If the welding temperature is ≤120℃, it meets the standard. If the welding temperature is greater than 120℃, liquid nitrogen cooling is triggered.

[0038] Optionally, the S400 also includes:

[0039] S401: Using 3D scanning;

[0040] S402: point cloud comparison;

[0041] S403: If the error is less than or equal to the point cloud comparison error threshold, the model is judged as qualified for storage; if the error is greater than the point cloud comparison error threshold, the model is reversely corrected and the process returns to S100 to re-model the model.

[0042] Optionally, a 6kw fiber laser cutting machine model TruLaser5030 is used for cutting, with a cutting accuracy of ±0.01mm.

[0043] Optionally, a Leica Absolute Tracker AT960 3D laser positioning device is used with a positioning error of ≤0.05mm / m. The roller pressure range of the multi-axis rolling is 50-200kN, which is matched according to the R / h value.

[0044] A double-chamber grid-stiffened box-section curved steel member includes a curved steel member body, the curved steel member body includes an inner cabin and an outer cabin bent to the same side, the inner cabin is welded to the inner side of the outer cabin, and longitudinal ribs and transverse ribs distributed in an interlaced manner are provided in the cavity of the inner cabin. The longitudinal ribs and transverse ribs are both welded to the inner side plate of the inner cabin. There is a distance between the longitudinal ribs, the transverse ribs and the outer wall of the outer cabin. A plurality of longitudinal ribs are distributed at intervals along the height direction of the inner cabin, and a plurality of transverse ribs are distributed at intervals along the length direction of the inner cabin.

[0045] Optionally, the rib spacing S of the longitudinal ribs L ≤16t, where t is the thickness of the inner steel plate of the inner cabin; the middle section of the curved steel member is the plastic reinforcement zone, the two sides of the plastic reinforcement zone are the non-reinforced zone, the node reinforcement zone outside the non-reinforced zone, and the rib spacing of the transverse ribs in the plastic reinforcement zone, non-reinforced zone, and node reinforcement zone are S respectively. T1 、S T3 、S T2 , S T1 ≤2S L ,S T2 ≤2S L , S T3 ≤4S L .

[0046] Optionally, the height ratio of the inner compartment to the outer compartment is h1 / h2, and 0.2≤h1 / h2≤0.5, and the height of the transverse ribs and the longitudinal ribs is hr=5t~8t.

[0047] The present invention has the beneficial effects:

[0048] 1. Optimize the stress level of each plate in the box-section curved steel member under axial compression to avoid premature yielding or local buckling of the inner plate fibers, which may cause instability and failure of the member.

[0049] 2. Through the double-chamber section separation design (the height ratio of the inner and outer compartments is 0.2≤h1 / h2≤0.5), the stiffness center is shifted to the high-stress area. Combined with the synergistic strengthening effect of the orthogonal grid stiffeners, the axial compression buckling limit load is increased by more than 50%, effectively solving the asymmetric stress problem of curved components.

[0050] 3. Gradient stiffening rib arrangement based on curvature sensitivity analysis (longitudinal rib spacing S L ≤16t, the transverse rib area is divided into plastic reinforcement area, node reinforcement area and non-reinforcement area, and the transverse stiffening rib spacing in the reinforcement area is ≤2S L ), specifically suppressing the out-of-plane deformation of the curved plate and reducing the risk of local buckling.

[0051] 4. Digital manufacturing boasts advantages in precision and efficiency. Using dynamic compensation formulas for laser cutting, adaptive multi-axis rolling pressure matching, and 3D laser positioning, forming accuracy is improved by 40%. Segmented variable curvature bending combined with electromagnetically constrained springback control reduces rework by 60%. Through digital twin technology, 3D scanning point cloud comparison and model reverse correction enable closed-loop feedback on manufacturing errors, ensuring component geometric accuracy exceeding 99.5%. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] Figure 1 is a flow chart of the method of the present invention;

[0053] Figure 2 Schematic diagram of the manufacturing process;

[0054] Figure 3 It is the distribution map of plastic reinforcement area, non-reinforcement area and node reinforcement area;

[0055] Figure 4 for Figure 3 sectional view of ;

[0056] Figure 5 It is the staggered distribution diagram of transverse ribs and longitudinal ribs;

[0057] Figure 6 The cross-section of the existing single-chamber curved steel member is shown;

[0058] Figure 7 The figure is a comparison curve of the axial compression buckling limit load of the present invention and the existing curved steel members.

[0059] Reference numerals: 1 - outer compartment, 2 - inner compartment, 3 - cavity, 4 - transverse rib, 5 - longitudinal rib, 6 - inner side plate. DETAILED DESCRIPTION

[0060] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings, but the embodiments of the present invention are not limited thereto.

[0061] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "longitudinal", "lateral", "horizontal", "inside", "outside", "front", "back", "top", "bottom", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, or are the orientation or position relationship in which the inventive product is usually placed when used. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0062] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "having," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific contexts.

[0063] Example 1

[0064] like Figure 1 and Figure 2 As shown, a method for manufacturing a double-chamber grid-stiffened box-section curved steel member comprises the following steps:

[0065] S100: Obtain parameters of the curved steel member, input them into the design system, establish a BIM parametric model of the curved steel member, and generate a gradient stiffening rib scheme for the curved steel member based on the BIM parametric model;

[0066] S200: Obtain raw materials according to the processing plan;

[0067] S300: Bending and welding the raw materials to obtain a curved steel member having an outer compartment 1 and an inner compartment 2, wherein the inner compartment 2 has longitudinal ribs 5 and transverse ribs 4 that are staggered and distributed in a gradient pattern.

[0068] S400: Use digital twins to determine whether the curved steel member is qualified. If qualified, it is put into storage. If unqualified, it returns to S100 to re-establish the BIM parametric model.

[0069] Furthermore, S100 also includes:

[0070] S101: Start the design system and initialize the parameter input interface;

[0071] S102: Input the geometric parameters and material parameters of the curved steel member. The geometric parameters include the curvature radius R of the curved steel member, the cross-sectional height h of the outer compartment 1 and the inner compartment 2, and the arc length L of the curved steel member. The material parameters include the steel grade, which is Q355B.

[0072] S103: Curvature sensitivity analysis: R / h < 10 is a high-risk area, and R / h ≥ 10 is a low-risk area;

[0073] S104: If it is a high-risk area, use finite element reverse optimization and then output the stiffening rib parameters. The stiffening rib parameters include the longitudinal rib spacing S L , transverse rib spacing S T ;

[0074] S105: If it is a low-risk area, directly call the standard preset parameters of the longitudinal rib spacing and the transverse rib spacing stored in the database, where S L =20t,S T =60t, t is the wall thickness of the inner side plate 6 of the inner cabin 2;

[0075] S106: Generate a gradient stiffening rib solution and output a DXF processing file and a process parameter table.

[0076] Furthermore, S200 also includes:

[0077] S201: Laser cutting of the plates for the inner and outer compartments 2 and 1, as well as the transverse and longitudinal ribs 4 and 5. The cutting is performed using the dynamic compensation formula 0.5 + 0.5t / R, where R is the radius of curvature of the curved steel member (in mm) to compensate for deformation errors caused by the curvature.

[0078] S202: 3D laser positioning;

[0079] S203: Using multi-axis linkage plate bending to bend the plates of the inner cabin 2 and the outer cabin 1;

[0080] S204: Plate forming test, the test qualification standard is determined by the following formula: , R is the curvature radius, L is the arc length, △R is the curvature radius error value, △L is the arc length error value;

[0081] S205: Dynamic compensation adjustment is triggered when the error is greater than the plate forming detection error threshold, that is, the dynamic compensation adjustment is triggered when the forming detection error is greater than 0.5%.

[0082] Furthermore, S300 also includes:

[0083] S301: If the error threshold of the plate forming test is less than or equal to the error threshold, perform segmented variable curvature bending, with the number of segments n=R / 2h. That is, if the plate forming test result is less than or equal to 0.5%, then perform the segmented variable curvature bending process;

[0084] S302: Bending die calibration; using 36-point adjustable die (existing product), angle adjustment step length 0.01 degree;

[0085] S303: Rebound test; Rebound test qualification criteria:

[0086]

[0087] S304: Electromagnetic constraint, triggered when the error threshold of the rebound detection is greater than 0.3 mm / m; that is, electromagnetic constraint is executed when the rebound detection is greater than 0.3 mm / m, with a magnetic field strength of 2000 A / m and an alternating frequency of 50 Hz;

[0088] S305: Assemble the longitudinal ribs 5 and transverse ribs 4, triggering at or below the springback detection error threshold, and weld them to the inner panel 6 of the inner compartment 2. Laser projection-assisted assembly is used, with a positioning accuracy of ±0.2 mm. Pulsed MAG welding is used, with parameters set to current I = 280 A, voltage U = 30 V, and welding speed v = 35 cm / min. Pulse welding is followed by laser hybrid welding, with a laser power of 4 kW, a wavelength of 1070 nm, an arc current of 320 A, and a gas mixture ratio of Ar + CO2 = 82% + 18%.

[0089] S306: Temperature detection: If the welding temperature is ≤120°C, it meets the standard. If the welding temperature is greater than 120°C, liquid nitrogen cooling is triggered. After the temperature meets the standard, vibration is required, with a vibration frequency of 120-150Hz and 25 minutes per meter.

[0090] Furthermore, S400 also includes:

[0091] S401: uses 3D scanning; the device used is GOM ATOS Core30;

[0092] S402: point cloud comparison;

[0093] S403: If the error is less than or equal to the point cloud comparison error threshold of 0.3mm, the object is deemed qualified for storage. If the error is greater than the point cloud comparison error threshold of 0.3mm, the model is reversed and the process returns to S100 for remodeling. The correction parameters are: Rcorrected = Rtheoretical + k (Rtheoretical - Rmeasured), where Rcorrected is the corrected curvature radius; Rinitial is the original curvature radius design value; and k is the correction coefficient, which can be initialized to 1.0 and calibrated using machine learning or historical data.

[0094] Furthermore, a 6kw fiber laser cutting machine model TruLaser5030 was used for cutting, with a cutting accuracy of ±0.01mm.

[0095] Furthermore, a Leica Absolute Tracker AT960 three-dimensional laser positioning device is used, with a positioning error of ≤0.05mm / m. The roller pressure range of the multi-axis linkage rolling is 50-200kN, which is matched according to the R / h value.

[0096] In this embodiment, curvature sensitivity analysis (R / h threshold determination) and finite element reverse optimization objectives are used to dynamically match structural parameters with stress characteristics. Laser cutting compensation formulas and forming inspection error determination are used to effectively compensate for sheet deformation errors caused by curvature. Segmented bending and electromagnetic restraint processes control springback to less than 0.3 mm / m, improving forming accuracy. 3D scanning point cloud comparison and model reverse correction enable automated iterative correction of manufacturing defects.

[0097] Example 2

[0098] like Figure 3-Figure 5 As shown, a double-chamber grid-stiffened box-section curved steel member includes a curved steel member body, which includes an inner cabin 2 and an outer cabin 1 bent to the same side, the inner cabin 2 is welded to the inner side of the outer cabin 1, and the cavity 3 of the inner cabin 2 is provided with longitudinal ribs 5 and transverse ribs 4 that are staggered with each other, the longitudinal ribs 5 and the transverse ribs 4 are all welded to the inner side plate 6 of the inner cabin 2, and there is a distance between the longitudinal ribs 5, the transverse ribs 4 and the outer wall of the outer cabin 1, a plurality of longitudinal ribs 5 are distributed at intervals along the height direction of the inner cabin 2, and a plurality of transverse ribs 4 are distributed at intervals along the length direction of the inner cabin 2.

[0099] Furthermore, the rib spacing S of the longitudinal ribs 5 is L ≤16t, where t is the thickness of the inner steel plate of the inner cabin 2; the middle section of the curved steel member is the plastic reinforcement zone, the two sides of the plastic reinforcement zone are the non-reinforced zones, the node reinforcement zone outside the non-reinforced zone, and the rib spacing of the transverse rib 4 in the plastic reinforcement zone, non-reinforced zone, and node reinforcement zone is S respectively. T1 、S T3 、S T2 , S T1 ≤2S L ,S T2 ≤2S L ,S T3 ≤4S L .

[0100] Furthermore, the height ratio of the inner compartment 2 to the outer compartment 1 is h1 / h2, and 0.2≤h1 / h2≤0.5, and the height of the transverse ribs 4 and the longitudinal ribs 5 is hr=5t~8t.

[0101] In this embodiment, a double-chamber cross-section is adopted: the traditional single-chamber box-shaped section is divided into an inner chamber 2 and an outer chamber 1, and the height ratio h1 / h2 of the two chambers is determined by multi-objective optimization to be 0.2≤h1 / h2≤0.5 (preferably 0.3).

[0102] Mechanical Mechanism: Due to the axial compression characteristics of a bent rod, the inner steel plate enters a plastic state first. As the axial force increases, the plastic zone gradually expands outward, leading to component instability and failure. This invention primarily considers shifting the cross-section's center of stiffness inward through a dual-compartment design, improving the stress levels of the inner and outer steel plates and thereby enhancing the overall compressive stability of the component.

[0103] Finite element verification: After setting up the double cabin, the steel consumption of the component increased by 19.6%, but the axial compression buckling limit load increased by 58.1%.

[0104] The inner side of the inner chamber 2 is provided with longitudinal ribs 5 and transverse ribs 4 arranged orthogonally, with a longitudinal rib spacing S L Satisfy S L ≤16t (t is the thickness of the inner steel plate of the inner compartment 2); the transverse rib spacing is S T , divided into S T1 、S T2 、S T3 , S T1 The transverse rib spacing of the section with the maximum deviation from the axial force centerline. The inner steel plate of this section is the first to enter the plastic state under the action of axial compression. In order to make full use of the post-yield strength of the steel plate and avoid the plastic state from developing too quickly to the outside to improve the stable ultimate bearing capacity of the component, this section can be called the plastic densification zone. The section length is taken as the component length L*20% (and ≥2h). The transverse rib spacing in this section meets S T1 ≤2S L , ensure that the sub-panel (the sub-area formed by the inner side panel 6 of the inner compartment separated by the longitudinal ribs 5 and the transverse ribs 4) has a height-to-width ratio α=S T1 / S L ≤2; S T2 The transverse rib spacing near the node area at the end of the component can be called the node density area. The section length is L*15% of the component length (and ≥1.5h). The transverse rib spacing in this section meets S T2 ≤4S L ;S T3 The area other than the plastic densification area and the node densification area can be called the non-densification area. The transverse rib spacing in this section meets S T3 ≤4S1, rib height hr=5t~8t (t is the thickness of the inner steel plate), local buckling is suppressed by adding bending stiffness and the overall stability of the component is improved.

[0105] like Figure 7As shown in the figure, the solid line represents the axial compressive load-vertical displacement curve of this scheme, and the dotted line represents the axial compressive load-vertical displacement curve of the existing single box chamber. The stress level of each plate of the box-section curved steel member under axial compression is optimized to avoid premature yielding or local buckling of the fibers of the inner plate, which may cause instability and failure of the member. Through the double-chamber section separation design, the stiffness center is shifted to the high stress area. Combined with the synergistic strengthening effect of the orthogonal grid stiffeners, the axial compressive buckling limit load is increased by more than 50%, effectively solving the asymmetric stress problem of the curved member.

[0106] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Based on the technical essence of the present invention and within the spirit and principles of the present invention, any simple modification, equivalent replacement and improvement of the above embodiment shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A method for manufacturing a double-chamber grid-reinforced box-section curved steel member, characterized in that: The following steps are involved: S100: Obtain parameters of the curved steel member, input them into the design system, establish a BIM parametric model of the curved steel member, and generate a gradient stiffening rib scheme for the curved steel member based on the BIM parametric model; S2 00: Obtain raw materials according to the processing plan; S300: Bending and welding the raw materials to obtain a curved steel member having an outer compartment and an inner compartment, wherein the inner compartment has longitudinal ribs and transverse ribs that are staggered and distributed in a gradient pattern; S400: Determine whether the curved steel member is qualified through digital twins. If qualified, it is put into storage. If unqualified, it returns to S100 to re-establish the BIM parametric model; S101: Start the design system and initialize the parameter input interface; S102: Input the geometric parameters and material parameters of the curved steel member. The geometric parameters include the curvature radius R of the curved steel member, the cross-sectional height h of the outer compartment and the inner compartment, and the arc length L of the curved steel member. The material parameters include the steel grade. S103: Curvature sensitivity analysis: R / h < 10 is a high-risk area, and R / h ≥ 10 is a low-risk area; S104: If it is a high-risk area, finite element reverse optimization is used to output the stiffening rib parameters, including longitudinal rib spacing and transverse rib spacing; S105: If it is a low-risk area, directly call the standard preset parameters of the longitudinal rib spacing and the transverse rib spacing stored in the database; S106: Generate a gradient stiffening rib solution and output a DXF processing file and a process parameter table.

2. The method for manufacturing a double-chamber grid-reinforced box-section curved steel member according to claim 1, characterized in that: The S200 also includes: S201: Laser cutting blanking; S202: 3D laser positioning; S203: Use multi-axis linkage plate bending to bend the plates of the inner and outer cabins; S204: Sheet forming inspection; S205: Dynamic compensation adjustment is triggered when the error threshold of the sheet forming detection is greater than the error threshold.

3. The method for manufacturing a double-chamber grid-reinforced box-section curved steel member according to claim 1, characterized in that: The S300 also includes: S301: If the error is less than or equal to the plate forming detection error threshold, perform segmented variable curvature bending, with the number of segments n=R / 2h; S302: Bending die calibration; S303: Rebound detection; S304: Electromagnetic restraint, triggered when the error is greater than the rebound detection threshold; S305: The longitudinal ribs and transverse ribs are assembled, triggered at an error threshold equal to or less than the springback detection threshold, and welded to the inner cabin inner side panels; S306: Temperature detection. If the welding temperature is ≤120℃, it meets the standard. If the welding temperature is greater than 120℃, liquid nitrogen cooling is triggered.

4. The method for manufacturing a double-chamber grid-reinforced box-section curved steel member according to claim 1, characterized in that: The S400 also includes: S401: Using 3D scanning; S402: point cloud comparison; S403: If the error is less than or equal to the point cloud comparison error threshold, the model is judged as qualified for storage; if the error is greater than the point cloud comparison error threshold, the model is reversely corrected and the process returns to S100 to re-model the model.

5. The method for manufacturing a double-chamber grid-reinforced box-section curved steel member according to claim 2, characterized in that: A 6kw fiber laser cutting machine, model TruLaser5030, is used for cutting, with a cutting accuracy of ±0.01mm.

6. The method for manufacturing a double-chamber grid-reinforced box-section curved steel member according to claim 2, characterized in that: The Leica Absolute Tracker AT960 3D laser positioning device is used, with a positioning error of ≤0.05mm / m. The roller pressure range of the multi-axis linkage rolling is 50-200kN, which is matched according to the R / h value.

7. A double-cell grid-reinforced box-section curved steel member applied to the manufacturing method of a double-cell grid-reinforced box-section curved steel member according to any one of claims 1 to 6, characterized in that: The curved steel member body includes an inner cabin and an outer cabin bent to the same side, the inner cabin is welded to the inner side of the outer cabin, and the cavity of the inner cabin is provided with longitudinal ribs and transverse ribs distributed alternately with each other. The longitudinal ribs and transverse ribs are welded to the inner side plate of the inner cabin, and there is a distance between the longitudinal ribs, the transverse ribs and the outer wall of the outer cabin. A plurality of longitudinal ribs are distributed at intervals along the height direction of the inner cabin, and a plurality of transverse ribs are distributed at intervals along the length direction of the inner cabin.

8. The double-cell grid-reinforced box-section curved steel member according to claim 7, characterized in that: The rib spacing S of the longitudinal ribs L ≤16t, where t is the thickness of the inner steel plate of the inner cabin; the middle section of the curved steel member is the plastic reinforcement zone, the two sides of the plastic reinforcement zone are the non-reinforced zone, the node reinforcement zone outside the non-reinforced zone, and the rib spacing of the transverse ribs in the plastic reinforcement zone, non-reinforced zone, and node reinforcement zone are S respectively. T1 、S T3 、S T2 , S T1 ≤2S L ,S T2 ≤2S L , S T3 ≤4S L .

9. The double-cell grid-reinforced box-section curved steel member according to claim 8, characterized in that: The height ratio of the inner compartment to the outer compartment is h1 / h2, and 0.2≤h1 / h2≤0.5, and the height of the transverse ribs and the longitudinal ribs is hr=5t~8t.

Images