A method for manufacturing lifting lug nodes for Q460GJ ultra-thick plates

Abstract

This invention relates to the field of high-strength material structure manufacturing technology, and discloses a method for manufacturing lifting lug nodes of Q460GJ ultra-thick plates, including the following steps: Step 1: Determine the dimensional allowance for each part; Step 2: Cut the body material and pre-cut the lug pin holes and plug welding holes; Step 3: Cut the bevel according to the drawing requirements, paying attention to cutting on both sides simultaneously and straightening it; Step 4: The lifting lug a and the lifting lug b on both sides of the lifting lug a are pre-welded to the mounting plate, and then the whole is boring; Step 5: Set up a qualified jig and place the base plate; using the base plate as a reference, simultaneously weld the lifting lug b and BH web plates symmetrically distributed on both sides of the lifting lug a; Step 6: Assemble and weld the cross stiffeners and side panels in sequence; Step 7: Assemble and weld the upper and lower flanges of BH; Step 8: Using the base plate as a reference, assemble and weld the cross column on the lower side of the base plate. This invention effectively controls welding deformation, ensures structural accuracy, and prevents lamellar tearing.

Description

Technical Field

[0001] This invention relates to the field of high-strength material structure manufacturing technology, and in particular to a method for manufacturing a lifting lug node for a Q460GJ ultra-thick plate. Background Technology

[0002] As a crucial link in driving structural development, the development of building materials is inseparable from the emergence of new structures. With the demand for high-rise buildings shifting from simple to multifunctional and more complex designs, structural materials with higher processing and mechanical properties have become the sought-after targets. Against this backdrop, Q460GJ, as a high-strength steel, possesses excellent ductility and high strength, which can further improve the safety and reliability of structures, while also effectively reducing component size and structural weight, providing buildings with more usable space and design options.

[0003] Cable-stayed structures are a novel transfer layer design technology that effectively addresses the problem of limited building space. As a crucial connecting component of cable-stayed structures, the quality, safety, and reliability of the lug connection nodes are paramount to the entire structure. The organic integration of Q460GJ ultra-thick plates with the lug connection nodes ensures both the overall rigidity and stability of the nodes while reducing the structure's self-weight and saving construction costs. Therefore, using Q460GJ in cable-stayed structures of high-rise buildings offers significant advantages.

[0004] However, the Q460GJ ultra-thick plate ranges in thickness from 60-300mm. A 100mm thick plate is significantly more difficult to weld than a 60mm plate. Due to its high strength, the actual amount of welding required is large, resulting in significant welding deformation. Furthermore, the excessive thickness also presents a challenge for post-weld correction. In addition, the lifting lug structure has a relatively complex structure, making it prone to lamellar tearing. Therefore, ensuring high precision in structural fabrication, controlling welding deformation, and preventing lamellar tearing are crucial aspects of the manufacturing process.

[0005] CN114396121A discloses an ultra-thick plate irregular box-type combined cable node and its manufacturing method. Its two lifting lugs are parallel to each other. The lifting lugs and the frame are welded with full penetration welding. The bevel is welded with root cleaning welding and a K-shaped bevel is opened. The inner bevel angle is 40° and the outer bevel angle is 50°. When there is an angle between the two lifting lugs, lamellar tearing cannot be avoided during welding. Summary of the Invention

[0006] To address the aforementioned deficiencies, the present invention aims to provide a method for manufacturing lifting lug nodes of Q460GJ ultra-thick plates that effectively controls welding deformation, ensures structural accuracy, and prevents lamellar tearing.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a method for manufacturing lifting lug nodes for Q460GJ ultra-thick plates, comprising the following steps:

[0008] Step 1: Determine the dimensional allowance for each part;

[0009] Step 2: The CNC cutting machine cuts the body and pre-cuts the ear plate pin holes and plug welding holes;

[0010] Step 3: Cut the bevel according to the requirements of the drawing, and make sure to cut on both sides at the same time, and straighten it.

[0011] Step 4: The lifting lugs a and the lifting lugs b on both sides of the lifting lugs a are pre-welded to the mounting plate, and then the whole assembly is bored. The outer and inner edges of the mounting plate are welded to the three lifting lugs using bevel welding, and the contact surfaces between the mounting plate and the three lifting lugs are fixed by plug welding holes.

[0012] Step 5: Set up a qualified jig and place the base plate;

[0013] Using the base plate as a reference, assemble and weld lifting lug plate a, lifting lug plate b, and BH web plate; lifting lug plate b is symmetrically distributed on both sides of lifting lug plate a, and BH web plate is also symmetrically distributed on both sides of lifting lug plate a; one BH web plate corresponds to one lifting lug plate b, and the two are located on a straight line; weld the symmetrical parts on both sides simultaneously.

[0014] Step 6: Assemble and weld the cross stiffeners and side panels in sequence;

[0015] The cross stiffener is located between the lug plate a and lug plate b, lug plate a and BH web plate, and lug plate b and BH web plate, and is parallel to the bottom plate; the side plate is located between the lug plate a and lug plate b, lug plate a and BH web plate, and lug plate b and BH web plate, and is perpendicular to the bottom plate.

[0016] Step 7: Assemble and weld the upper and lower flanges of BH;

[0017] Step 8: Using the base plate as a reference, assemble and weld the cross-shaped posts on the underside of the base plate.

[0018] By adopting the above technical solution, and by simultaneously welding the symmetrical parts on both sides of the lifting lug plate a: lifting lug plate b and BH web plate, and by welding the horizontal stiffening plate parallel to the bottom plate and the side panel perpendicular to the bottom plate between the lifting lug plate a and the lifting lug plate b, the lifting lug plate a and the BH web plate, the welded lifting lug node structure has high precision and less welding deformation during welding, which is beneficial to preventing lamellar tearing during welding.

[0019] Preferably, in step 1, the dimensional allowance is added as follows: 3-5 mm allowance is added to the lifting lug plate a, lifting lug plate b, bottom plate, BH web plate and BH lower flange in the width direction, and 3-6 mm allowance is added to the lifting lug plate a, lifting lug plate b and BH web plate in the length direction.

[0020] By adopting the above technical solution, the thickness of the lifting lug plate a, lifting lug plate b, bottom plate and BH web plate is 100mm, the material is Q460GJC, the welding process is CP full penetration welding, and allowances are added in the width and length directions to compensate for the shrinkage of width and length after welding.

[0021] Preferably, in step 2, the pre-cut diameter of the ear plate pin hole and plug welding hole is equal to the actual hole diameter minus 20mm, leaving a 20mm boring allowance.

[0022] By adopting the above technical solution, the amount of boring work can be reduced and processing costs can be saved by pre-cutting holes.

[0023] Preferably, in step 4, bevels with an angle of 40° to 45° and a melting depth of 18 to 20 mm are made on the four edges of the mounting plate.

[0024] Preferably, in step 4, the lifting lugs a and b are welded to the inner side of the hole in the mounting plate.

[0025] By adopting the above technical solution, rust can be avoided between the lifting lug plate and the mounting plate due to the different vertical planes, thus ensuring the quality of the inner wall of the hole.

[0026] By adopting the above technical solution, and using a bevel with an angle of 40° to 45° and a penetration depth of 18 to 20 mm, it is ensured that there is a certain weld connection between the lifting lugs a and b and the inner wall of the plate after boring.

[0027] Preferably, in step 5, the bevel between the lug plate a and lug plate b, and the web of BH is 30-35°.

[0028] By adopting the above technical solution, considering that the weld is a full penetration weld, which is prone to deformation after welding, and that a 100mm steel plate is difficult to straighten, the bevel is set to 30-35° to reduce the amount of welding shrinkage.

[0029] Preferably, in step 5, the assembly positions of the lug plate b and the BH web plate are offset by 2 to 4 degrees towards the lug plate a, and reverse deformation treatment is performed between the lug plate a and the lug plate b, and between the lug plate a and the BH web plate.

[0030] By adopting the above technical solution, the lifting lug plate b and the BH web plate are symmetrically distributed on both sides of the lifting lug plate a, and the symmetrical parts on both sides are welded simultaneously, reducing welding shrinkage deformation. Reverse deformation treatment is performed between the lifting lug plate a and the lifting lug plate b, and between the lifting lug plate a and the BH web plate to prevent unilateral angular deformation during welding, reduce the difficulty of post-weld correction, and facilitate structural accuracy control.

[0031] Preferably, in steps 6 and 7, there are T-joints between the lug plate a, lug plate b, and the BH web and the cross bracing, between the cross bracing and the side panel, and between the upper flange of BH and the BH web. Therefore, the middle BH web is provided with an anti-laminated tearing bevel in its thickness direction. A 30-35° single-sided V-shaped clearing bevel is provided on one side of the BH web, and a single V-shaped clearing bevel with a bevel width of not less than t / 2+2 and a bevel angle of ≥30° is provided on the other side to form an anti-laminated tearing bevel.

[0032] By adopting the above technical solution and opening anti-lamellar tearing bevels, the purpose of preventing lamellar tearing is achieved, thereby reducing the welding tensile stress generated in the thickness direction of the middle sandwich plate by the two side plates during the welding shrinkage process.

[0033] Compared with the prior art, the present invention has the following advantages:

[0034] 1. This invention achieves high precision in the welding of symmetrical components on both sides of the lifting lug plate a: lifting lug plate b and BH web plate. The lifting lug plate a and lifting lug plate b, the lifting lug plate a and the BH web plate, and the lifting lug plate b and the BH web plate are respectively welded with a horizontal stiffening plate parallel to the bottom plate and a side panel perpendicular to the bottom plate. The resulting lifting lug node structure has high precision and less welding deformation during welding, which helps to prevent lamellar tearing during welding.

[0035] 2. To address the risk of lamellar tearing, this invention improves the bevel design of the T-joint by creating an anti-lamellar tearing bevel in the thickness direction of the BH web. Specifically, a 30-35° single-sided V-shaped bevel is created on one side of the BH web, and a single V-shaped root bevel with a bevel width of not less than t / 2+2 and a bevel angle of ≥30° is created on the other side. This reduces the tensile welding stress generated by the two side plates on the thickness direction of the BH web during welding shrinkage, thus preventing lamellar tearing.

[0036] 3. In this invention, the lifting lug plate b and the BH web plate are symmetrically distributed on both sides of the lifting lug plate a, with one BH web plate corresponding to one lifting lug plate b. The symmetrical parts on both sides of the lifting lug plate a are welded synchronously. The assembly position of the lifting lug plate b and the BH web plate is offset towards the lifting lug plate a by 2-4° from the original position. Reverse deformation treatment is performed between the lifting lug plate a and the lifting lug plate b, and between the lifting lug plate a and the BH web plate. Welding deformation is controlled by synchronous welding and reverse deformation treatment, which reduces the difficulty of post-weld correction. This not only helps to control the overall structural accuracy, but also reduces the workload of post-weld correction and saves labor costs, resulting in good economic and social benefits.

[0037] 4. This invention fully considers the characteristics of Q460GJC material, controls the blanking size, and reduces the impact of welding on dimensional deviations. At the same time, considering the concentricity requirements of the pin holes of the lifting lug plate and the mounting plate, a processing approach of pre-cutting holes and then boring the whole hole is proposed. In order to ensure the quality of the inner wall of the hole, the inner side of the hole of the lifting lug plate and the mounting plate is welded to avoid rusting in the gap between them. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of the lifting lug node of a Q460GJ ultra-thick plate according to the present invention.

[0039] Figure 2 This is a top view schematic diagram of the lifting lug node of a Q460GJ ultra-thick plate according to the present invention.

[0040] Figure 3 This is a front view schematic diagram of the lifting lug node of a Q460GJ ultra-thick plate according to the present invention.

[0041] Figure 4 This is a schematic diagram showing the connection between the web of the BH plate, the lug plate b, and the upper flange of the BH plate according to the present invention.

[0042] Among them: 1. Lifting lug a, 2. Lifting lug b, 3. Adhesive plate, 4. Bottom plate, 5. BH web plate, 6. Cross stiffener plate, 7. Side plate, 8. BH lower flange, 9. BH upper flange, 10. Cross column. Detailed Implementation

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0044] A method for manufacturing lifting lug nodes for Q460GJ ultra-thick plates includes the following steps.

[0045] Step 1: As Figure 1 As shown, based on the structural node analysis, dimensional allowances are added for each part to prevent the post-weld dimensions from being too short. Considering the characteristics of Q460GJ material and combined with processing experience, it is determined that the lifting lugs a1 and b2, which are 100mm thick and made of Q460GJC, are connected to the base plate 4, and the BH web 5 and BH lower flange 8, which are also 100mm thick and made of Q460GJC, are all CP full penetration welds. Therefore, an allowance of 3-5mm is added in the width direction. The lifting lugs a1, b2, and BH web 5 are welded to each other, and the welds are full penetration. Therefore, an allowance of 3-6mm is added in the length direction.

[0046] Step 2: The CNC cutting machine cuts the main body and pre-cuts the pin holes and plug welding holes for the lifting lugs a1 and b2. Considering the large size of the pin holes, pre-cutting is used. The diameter of the pre-cut hole is equal to the actual hole diameter minus 20mm, leaving a 20mm allowance for boring. Furthermore, the pre-cutting process reduces the amount of boring work and saves processing costs.

[0047] Step 3: When cutting the bevel, follow the requirements of the drawing and ensure simultaneous cutting on both sides to reduce deformation and ensure straightness. To avoid secondary beveling, the bevel selection should be made in advance. Since the overall structure often has a T-joint, the intermediate plate should have an anti-lamellar tear bevel in its thickness direction. BH web 5 is the intermediate plate. Anti-lamellar tear bevel: A 30-35° single-sided V-shaped bevel is cut on one side of the intermediate plate, and a single V-shaped root bevel with a bevel width not less than t / 2+2 and a bevel angle ≥30° is cut on the other side of the intermediate plate. The addition of the anti-lamellar tear bevel can reduce the tensile welding stress in the thickness direction of the intermediate plate generated by the two side plates during welding shrinkage.

[0048] Step 4: To ensure the concentricity of the pin holes on the lifting lugs a1, b2, and plate 3, the lifting lugs a1 and b2 are pre-welded to the plate 3 before being bored as a whole. The outer and inner edges of the plate 3 are welded to the lifting lugs a1 and b2 using bevel welding, and the contact surfaces between the plate 3 and the lifting lugs a1 and b2 are fixed with five plug weld holes. To ensure the quality of the bored inner wall, bevels with an angle of 40°–45° and a penetration depth of 18–20 mm are made on the four edges of the plate 3 to ensure a certain weld connection between the lifting lugs a1, b2, and the inner wall of the plate 3 after boring. In addition, the lifting lugs a1 and b2 are welded to the inner side of the hole of the mounting plate 3 to avoid the situation where there is a significant gap between the lifting lugs a1, b2 and the inner wall of the mounting plate 3 due to different vertical surfaces. This would prevent rust from forming in the gap and ensure the quality of the inner wall of the hole.

[0049] Step 5: Set up a qualified jig and place the base plate 4. Using the base plate 4 as a reference, assemble and weld the lifting lugs a1, b2, and BH web 5. The lifting lugs b2 are symmetrically distributed on both sides of the lifting lugs a1, and the BH web 5 are also symmetrically distributed on both sides of the lifting lugs a1. One BH web 5 corresponds to one lifting lug b2, and the two are located in a straight line. A 45° natural bevel is formed between the lifting lugs a1, b2, and BH web 5. However, considering that the weld is a full penetration weld, it is prone to deformation after welding, and it is difficult to straighten a 100mm steel plate. Therefore, the bevel should be 30-35° to reduce welding shrinkage. The assembly position of the lifting lugs b2 and BH web 5 is offset 2-4° towards the lifting lugs a1 from the original position. By adopting the above technical solution, welding deformation is controlled through various preventive measures, reducing the difficulty of post-weld straightening and facilitating structural accuracy control.

[0050] Step 6: As Figure 2As shown, the cross stiffener 6 and side panel 7 are assembled and welded sequentially. The cross stiffener 6 is located between the lug plate a1 and lug plate b2, between lug plate a1 and web plate 5 (BH), and between lug plate b2 and web plate 5 (BH), and is parallel to the bottom plate 4. The side panel 7 is located between lug plate a1 and lug plate b2, between lug plate a1 and web plate 5 (BH), and between lug plate b2 and web plate 5 (BH), and is perpendicular to the bottom plate 4. There are T-joints between the lug plate a1, lug plate b2, and BH web plate 5 and the cross stiffener 6, and between the cross stiffener 6 and the side panel 7. Therefore, the corresponding intermediate plates should all have anti-lamellar tearing bevels in their thickness direction. That is, a 30-35° single-sided V-shaped clearing bevel should be opened on one side of the intermediate plate BH web plate 5, and a single V-shaped clearing bevel with a bevel width of not less than t / 2+2 and a bevel angle of ≥30° should be opened on the other side of the intermediate plate to avoid the risk of lamellar tearing.

[0051] Step 7: As Figure 3 As shown, the upper flange 9 and lower flange 8 of BH are welded together. T-joints exist at both the upper flange 9 and lower flange 8 of BH and the web 5 of BH. Therefore, anti-lamellar tearing bevels should be opened in the thickness direction of the web 5 of BH. A 30-35° single-sided V-shaped bevel should be opened on one side of the intermediate clamping plate, and a single V-shaped root bevel with a bevel width not less than t / 2+2 and a bevel angle ≥30° should be opened on the other side of the intermediate clamping plate to avoid the risk of lamellar tearing.

[0052] Step 8: Using the base plate 4 as a reference, assemble and weld the lower cross post 10. The cross post 10 is located on the lower side of the base plate 4 and is welded to the base plate 4 using full penetration welding.

[0053] This application welds lifting lugs a1, b2, and a BH web plate 5 onto the base plate 4. The symmetrical components on both sides of lifting lug a1, lifting lug b2 and BH web plate 5, are welded simultaneously. A mounting plate 3 is welded onto each of lifting lugs a1 and b2. A welding bevel is formed between lifting lugs a1, b2, and BH web plate 5. Lifting lugs b2 are symmetrically distributed on both sides of lifting lug a1, and BH web plates 5 are also symmetrically distributed on both sides of lifting lug a1. One BH web plate 5 corresponds to one lifting lug b2, and the two are located in a straight line. A cross brace 6 and a side panel 7 are welded between lifting lugs a1 and b2, between lifting lugs a1 and BH web plate 5, and between lifting lugs b2 and BH web plate 5. The cross brace 6 is parallel to the base plate 4, and the side panel 7 is perpendicular to the base plate 4. [The text repeats itself here, so the translation ends here.] Figure 4 As shown, the upper flange 9 of BH is welded to the top surface of one end of the web 5, and the lower flange 8 of BH is welded to the bottom surface. A cross-shaped column 10 is welded to the bottom surface of the base plate 4. This novel structure ensures high welding precision and is suitable for beam structures. Welding deformation is controlled through synchronous welding, reverse deformation, and the creation of anti-laminated tearing bevels, reducing the difficulty of post-weld correction and effectively preventing lamellar tearing.

[0054] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention; the objectives of the present invention have been fully and effectively achieved. The functions and structural principles of the present invention have been demonstrated and explained in the embodiments, and any modifications or variations of the embodiments of the present invention may be made without departing from the stated principles.

Claims

1. A method for manufacturing lifting lug nodes for a Q460GJ ultra-thick plate, characterized in that, Includes the following steps: Step 1: Determine the dimensional allowance for each part; Step 2: The CNC cutting machine cuts the body and pre-cuts the ear plate pin holes and plug welding holes; Step 3: Cut the bevel according to the requirements of the drawing, and make sure to cut on both sides at the same time, and straighten it. Step 4: The lifting lugs a and the lifting lugs b on both sides of the lifting lugs a are pre-welded to the mounting plate, and then the whole assembly is bored. The edges of the mounting plate and the three lifting lugs are all welded with bevel welding, and the contact surfaces between the mounting plate and the three lifting lugs are all fixed with plug welding holes. Step 5: Set up a qualified jig and place the base plate; Using the base plate as a reference, assemble and weld lifting lugs a, lifting lugs b, and the BH web. Lifting lugs b are symmetrically distributed on both sides of lifting lugs a, and the BH web is also symmetrically distributed on both sides of lifting lugs a. The assembly positions of lifting lugs b and the BH web are offset 2-4° from the lifting lugs a side based on the original position. Reverse deformation treatment is performed between lifting lugs a and b, and between lifting lugs a and the BH web. One BH web corresponds to one lifting lug b, and the two are located on a straight line. Simultaneously weld the symmetrical parts on both sides. A 30-35° single-sided V-shaped root cleaning bevel is opened on one side of the BH web, and a single V-shaped root cleaning bevel with a bevel width of not less than t / 2+2 and a bevel angle ≥30° is opened on the other side to form a bevel that resists lamellar tearing. Step 6: Assemble and weld the cross stiffeners and side panels in sequence; The cross stiffener is located between the lug plate a and lug plate b, lug plate a and BH web plate, and lug plate b and BH web plate, and is parallel to the bottom plate; the side plate is located between the lug plate a and lug plate b, lug plate a and BH web plate, and lug plate b and BH web plate, and is perpendicular to the bottom plate. Step 7: Assemble and weld the upper and lower flanges of BH; Step 8: Using the base plate as a reference, assemble and weld the cross-shaped column on the underside of the base plate.

2. The method for manufacturing a lifting lug node for a Q460GJ ultra-thick plate according to claim 1, characterized in that: In step 1, the dimensional allowance is added as follows: 3-5 mm of allowance is added to the width direction of the lug plate a, lug plate b, bottom plate, BH web plate and BH lower flange, and 3-6 mm of allowance is added to the length direction of the lug plate a, lug plate b and BH web plate.

3. The method for manufacturing a lifting lug node for a Q460GJ ultra-thick plate according to claim 1, characterized in that: In step 2, the pre-cut diameter of the ear plate pin hole and plug welding hole is equal to the actual hole diameter minus 20mm, with a 20mm boring allowance.

4. The method for manufacturing a lifting lug node for a Q460GJ ultra-thick plate according to claim 1, characterized in that: In step 4, bevels with an angle of 40° to 45° and a melting depth of 18 to 20 mm are made on the four edges of the mounting plate.

5. The method for manufacturing a lifting lug node for a Q460GJ ultra-thick plate according to claim 1, characterized in that: In step 4, the lifting lugs a and b are welded to the inner side of the hole in the mounting plate.

6. The method for manufacturing a lifting lug node for a Q460GJ ultra-thick plate according to claim 1, characterized in that: In step 5, the bevel between the lug plate a and lug plate b, and the web of BH is 30-35°.

Images